Voyager 2 Explained

Voyager 2
Image Alt:Artist's rendering of the Voyager spacecraft, a small-bodied spacecraft with a large, central dish and multiple arms and antennas extending from the dish
Mission Type:Planetary exploration
Operator:NASA / JPL[1]
Cospar Id:1977-076A[2]
Satcat:10271
Mission Duration:
  • elapsed
  • Planetary mission:
  • Interstellar mission: elapsed
Manufacturer:Jet Propulsion Laboratory
Launch Mass:721.9kg (1,591.5lb)[3]
Power:470 watts (at launch)
Launch Date: UTC
Launch Rocket:Titan IIIE
Launch Site:Cape Canaveral LC-41
Interplanetary:
Type:flyby
Distance:570000km (350,000miles)
Arrival Date:July 9, 1979
Type:flyby
Distance:101000km (63,000miles)
Arrival Date:August 26, 1981
Type:flyby
Distance:81500km (50,600miles)
Arrival Date:January 24, 1986
Type:flyby
Distance:4951km (3,076miles)
Arrival Date:August 25, 1989
Programme:Large Strategic Science Missions
Planetary Science Division
Previous Mission:Viking 2
Next Mission:Voyager 1
Programme2:Voyager program

Voyager 2 is a space probe launched by NASA on August 20, 1977, as a part of the Voyager program. It was launched on a trajectory towards the gas giants Jupiter and Saturn and enabled further encounters with the ice giants Uranus and Neptune. It remains the only spacecraft to have visited either of the ice giant planets, and was the third of five spacecraft to achieve Solar escape velocity, which will allow it to leave the Solar System. It has been sending scientific data to Earth for, making it the oldest active space probe.[4] Launched 16 days before its twin Voyager 1, the primary mission of the spacecraft was to study the outer planets and its extended mission is to study interstellar space beyond the Sun's heliosphere.

Voyager 2 successfully fulfilled its primary mission of visiting the Jovian system in 1979, the Saturnian system in 1981, Uranian system in 1986, and the Neptunian system in 1989. The spacecraft is now in its extended mission of studying the interstellar medium. It is at a distance of 136.1AU from Earth .[5]

The probe entered the interstellar medium on November 5, 2018, at a distance of 119.7abbr=unitNaNabbr=unit from the Sun[6] and moving at a velocity of 15.341km/s[7] relative to the Sun. Voyager 2 has left the Sun's heliosphere and is traveling through the interstellar medium, though still inside the Solar System, joining Voyager 1, which had reached the interstellar medium in 2012.[8] [9] [10] [11] Voyager 2 has begun to provide the first direct measurements of the density and temperature of the interstellar plasma.[12]

Voyager 2 remains in contact with Earth through the NASA Deep Space Network.[13] Communications are the responsibility of Australia's DSS 43 communication antenna, located near Canberra.[14]

History

Background

In the early space age, it was realized that a periodic alignment of the outer planets would occur in the late 1970s and enable a single probe to visit Jupiter, Saturn, Uranus, and Neptune by taking advantage of the then-new technique of gravity assists. NASA began work on a Grand Tour, which evolved into a massive project involving two groups of two probes each, with one group visiting Jupiter, Saturn, and Pluto and the other Jupiter, Uranus, and Neptune. The spacecraft would be designed with redundant systems to ensure survival throughout the entire tour. By 1972 the mission was scaled back and replaced with two Mariner program-derived spacecraft, the Mariner Jupiter-Saturn probes. To keep apparent lifetime program costs low, the mission would include only flybys of Jupiter and Saturn, but keep the Grand Tour option open. As the program progressed, the name was changed to Voyager.[15]

The primary mission of Voyager 1 was to explore Jupiter, Saturn, and Saturn's largest moon, Titan. Voyager 2 was also to explore Jupiter and Saturn, but on a trajectory that would have the option of continuing on to Uranus and Neptune, or being redirected to Titan as a backup for Voyager 1. Upon successful completion of Voyager 1's objectives, Voyager 2 would get a mission extension to send the probe on towards Uranus and Neptune.[16] Titan was selected due to the interest developed after the images taken by Pioneer 11 in 1979, which had indicated the atmosphere of the moon was substantial and complex. Hence the trajectory was designed for optimum Titan flyby.[17] [18]

Spacecraft design

Constructed by the Jet Propulsion Laboratory (JPL), Voyager 2 included 16 hydrazine thrusters, three-axis stabilization, gyroscopes and celestial referencing instruments (Sun sensor/Canopus Star Tracker) to maintain pointing of the high-gain antenna toward Earth. Collectively these instruments are part of the Attitude and Articulation Control Subsystem (AACS) along with redundant units of most instruments and 8 backup thrusters. The spacecraft also included 11 scientific instruments to study celestial objects as it traveled through space.[19]

Communications

Built with the intent for eventual interstellar travel, Voyager 2 included a large, 3.7m (12.1feet) parabolic, high-gain antenna (see diagram) to transceive data via the Deep Space Network on Earth. Communications are conducted over the S-band (about 13 cm wavelength) and X-band (about 3.6 cm wavelength) providing data rates as high as 115.2 kilobits per second at the distance of Jupiter, and then ever-decreasing as distance increases, because of the inverse-square law.[20] When the spacecraft is unable to communicate with Earth, the Digital Tape Recorder (DTR) can record about 64 megabytes of data for transmission at another time.[21]

Power

Voyager 2 is equipped with three multihundred-watt radioisotope thermoelectric generators (MHW RTGs). Each RTG includes 24 pressed plutonium oxide spheres. At launch, each RTG provided enough heat to generate approximately 157 W of electrical power. Collectively, the RTGs supplied the spacecraft with 470 watts at launch (halving every 87.7 years). They were predicted to allow operations to continue until at least 2020, and continued to provide power to five scientific instruments through the early part of 2023. In April 2023 JPL began using a reservoir of backup power intended for an onboard safety mechanism. As a result, all five instruments are expected to continue operation through 2026.[22] [23] [24]

Attitude control and propulsion

Because of the energy required to achieve a Jupiter trajectory boost with an 825kg (1,819lb) payload, the spacecraft included a propulsion module made of a 1123kg (2,476lb) solid-rocket motor and eight hydrazine monopropellant rocket engines, four providing pitch and yaw attitude control, and four for roll control. The propulsion module was jettisoned shortly after the successful Jupiter burn.

Sixteen hydrazine Aerojet MR-103 thrusters on the mission module provide attitude control.[25] Four are used to execute trajectory correction maneuvers; the others in two redundant six-thruster branches, to stabilize the spacecraft on its three axes. Only one branch of attitude control thrusters is needed at any time.[26]

Thrusters are supplied by a single 70adj=onNaNadj=on diameter spherical titanium tank. It contained 100kg (200lb) of hydrazine at launch, providing enough fuel until 2034.[27]

Scientific instruments

See main article: Voyager program.

Instrument nameAbr.Description
(ISS)Utilized a two-camera system (narrow-angle/wide-angle) to provide imagery of the outer planets and other objects along the trajectory.
(RSS)Utilized the telecommunications system of the Voyager spacecraft to determine the physical properties of planets and satellites (ionospheres, atmospheres, masses, gravity fields, densities) and the amount and size distribution of material in Saturn's rings and the ring dimensions.
(IRIS)Investigates both global and local energy balance and atmospheric composition. Vertical temperature profiles are also obtained from the planets and satellites as well as the composition, thermal properties, and size of particles in Saturn's rings.
(UVS)Designed to measure atmospheric properties, and to measure radiation.
(MAG)Designed to investigate the magnetic fields of Jupiter and Saturn, the solar-wind interaction with the magnetospheres of these planets, and the interplanetary magnetic field out to the solar wind boundary with the interstellar magnetic field and beyond, if crossed.
(PLS)Investigates the macroscopic properties of the plasma ions and measures electrons in the energy range from 5 eV to 1 keV.
(LECP)Measures the differential in energy fluxes and angular distributions of ions, electrons and the differential in energy ion composition.
(CRS)Determines the origin and acceleration process, life history, and dynamic contribution of interstellar cosmic rays, the nucleosynthesis of elements in cosmic-ray sources, the behavior of cosmic rays in the interplanetary medium, and the trapped planetary energetic-particle environment.
(PRA)Utilizes a sweep-frequency radio receiver to study the radio-emission signals from Jupiter and Saturn.
(PPS)Utilized a telescope with a polarizer to gather information on surface texture and composition of Jupiter and Saturn and information on atmospheric scattering properties and density for both planets.
(PWS)Provides continuous, sheath-independent measurements of the electron-density profiles at Jupiter and Saturn as well as basic information on local wave-particle interaction, useful in studying the magnetospheres.

Mission profile

Timeline of travel
DateEvent
1977-08-20Spacecraft launched at 14:29:00 UTC.
1977-12-10Entered asteroid belt.
1977-12-19Voyager 1 overtakes Voyager 2. (see diagram)
1978-06Primary radio receiver fails. The remainder of the mission flown using backup.
1978-10-21Exited asteroid belt
1979-04-25Start Jupiter observation phase
1981-06-05Start Saturn observation phase.
1985-11-04Start Uranus observation phase.
1987-08-2010 years of continuous flight and operation at 14:29:00 UTC.
1989-06-05Start Neptune observation phase.
1989-10-02Begin Voyager Interstellar Mission.
Interstellar phase[30] [31] [32]
1997-08-2020 years of continuous flight and operation at 14:29:00 UTC.
1998-11-13Terminate scan platform and UV observations.
2007-08-2030 years of continuous flight and operation at 14:29:00 UTC.
2007-09-06Terminate data tape recorder operations.
2008-02-22Terminate planetary radio astronomy experiment operations.
2011-11-07Switch to backup thrusters to conserve power[33]
2017-08-2040 years of continuous flight and operation at 14:29:00 UTC.
2018-11-05Crossed the heliopause and entered interstellar space.
2023-07-18Voyager 2 overtook Pioneer 10 as the second farthest spacecraft from the Sun.[34] [35]

Launch and trajectory

The Voyager 2 probe was launched on August 20, 1977, by NASA from Space Launch Complex 41 at Cape Canaveral, Florida, aboard a Titan IIIE/Centaur launch vehicle. Two weeks later, the twin Voyager 1 probe was launched on September 5, 1977. However, Voyager 1 reached both Jupiter and Saturn sooner, as Voyager 2 had been launched into a longer, more circular trajectory.[36] [37]

Voyager 1s initial orbit had an aphelion of 8.9AU, just a little short of Saturn's orbit of 9.5AU. Whereas, Voyager 2s initial orbit had an aphelion of 6.2AU, well short of Saturn's orbit.[38]

In April 1978, no commands were transmitted to Voyager 2 for a period of time, causing the spacecraft to switch from its primary radio receiver to its backup receiver.[39] Sometime afterwards, the primary receiver failed altogether. The backup receiver was functional, but a failed capacitor in the receiver meant that it could only receive transmissions that were sent at a precise frequency, and this frequency would be affected by the Earth's rotation (due to the Doppler effect) and the onboard receiver's temperature, among other things.[40] [41]

Encounter with Jupiter

Voyager 2s closest approach to Jupiter occurred at 22:29 UT on July 9, 1979. It came within 570000km (350,000miles) of the planet's cloud tops.[42] Jupiter's Great Red Spot was revealed as a complex storm moving in a counterclockwise direction. Other smaller storms and eddies were found throughout the banded clouds.[43]

Voyager 2 returned images of Jupiter, as well as its moons Amalthea, Io, Callisto, Ganymede, and Europa. During a 10-hour "volcano watch", it confirmed Voyager 1s observations of active volcanism on the moon Io, and revealed how the moon's surface had changed in the four months since the previous visit.[44] Together, the Voyagers observed the eruption of nine volcanoes on Io, and there is evidence that other eruptions occurred between the two Voyager fly-bys.[45]

Jupiter's moon Europa displayed a large number of intersecting linear features in the low-resolution photos from Voyager 1. At first, scientists believed the features might be deep cracks, caused by crustal rifting or tectonic processes. Closer high-resolution photos from Voyager 2, however, were puzzling: the features lacked topographic relief, and one scientist said they "might have been painted on with a felt marker". Europa is internally active due to tidal heating at a level about one-tenth that of Io. Europa is thought to have a thin crust (less than 30km (20miles) thick) of water ice, possibly floating on a 50abbr=unitNaNabbr=unit-deep ocean.[46] [47]

Two new, small satellites, Adrastea and Metis, were found orbiting just outside the ring. A third new satellite, Thebe, was discovered between the orbits of Amalthea and Io.

Encounter with Saturn

The closest approach to Saturn occurred at 03:24:05 UT on August 26, 1981.[48] When Voyager 2 passed behind Saturn, viewed from Earth, it utilized its radio link to investigate Saturn's upper atmosphere, gathering data on both temperature and pressure. In the highest regions of the atmosphere, where the pressure was measured at 70mbar,[49] Voyager 2 recorded a temperature of 82abbr=unitNaNabbr=unit. Deeper within the atmosphere, where the pressure was recorded to be 1200mbar, the temperature rose to 143K. The spacecraft also observed that the north pole was approximately 10C-change cooler at 100mbar than mid-latitudes, a variance potentially attributable to seasonal shifts (see also Saturn Oppositions).

After its Saturn fly-by, Voyager 2s scan platform experienced an anomaly causing its azimuth actuator to seize. This malfunction led to some data loss and posed challenges for the spacecraft's continued mission. The anomaly was traced back to a combination of issues, including a design flaw in the actuator shaft bearing and gear lubrication system, corrosion, and debris build-up. While overuse and depleted lubricant were factors,[50] other elements, such as dissimilar metal reactions and a lack of relief ports, compounded the problem. Engineers on the ground were able to issue a series of commands, rectifying the issue to a degree that allowed the scan platform to resume its function.[51] Voyager 2, which would have been diverted to perform the Titan flyby if Voyager 1 had been unable to, did not pass near Titan due to the malfunction, and subsequently, proceeded with its mission to explore the Uranian system.[52]

Encounter with Uranus

The closest approach to Uranus occurred on January 24, 1986, when Voyager 2 came within 81500sp=usNaNsp=us of the planet's cloudtops.[53] Voyager 2 also discovered 11 previously unknown moons: Cordelia, Ophelia, Bianca, Cressida, Desdemona, Juliet, Portia, Rosalind, Belinda, Puck and Perdita. The mission also studied the planet's unique atmosphere, caused by its axial tilt of 97.8°; and examined the Uranian ring system. The length of a day on Uranus as measured by Voyager 2 is 17 hours, 14 minutes. Uranus was shown to have a magnetic field that was misaligned with its rotational axis, unlike other planets that had been visited to that point,[54] and a helix-shaped magnetic tail stretching 10 million kilometers (6 million miles) away from the Sun.

When Voyager 2 visited Uranus, much of its cloud features were hidden by a layer of haze; however, false-color and contrast-enhanced images show bands of concentric clouds around its south pole. This area was also found to radiate large amounts of ultraviolet light, a phenomenon that is called "dayglow". The average atmospheric temperature is about 60K. The illuminated and dark poles, and most of the planet, exhibit nearly the same temperatures at the cloud tops.

The Voyager 2 Planetary Radio Astronomy (PRA) experiment observed 140 lightning flashes, or Uranian electrostatic discharges with a frequency of 0.9-40 MHz.[55] [56] The UEDs were detected from 600,000 km of Uranus over 24 hours, most of which were not visible. However, microphysical modeling suggests that Uranian lightning occurs in convective storms occurring in deep troposphere water clouds.[57] If this is the case, lightning will not be visible due to the thick cloud layers above the troposphere. Uranian lightning has a power of around 108 W, emits 1×10^7 J – 2×10^7 J of energy, and lasts an average of 120 ms.

Detailed images from Voyager 2s flyby of the Uranian moon Miranda showed huge canyons made from geological faults.[58] One hypothesis suggests that Miranda might consist of a reaggregation of material following an earlier event when Miranda was shattered into pieces by a violent impact.

Voyager 2 discovered two previously unknown Uranian rings.[59] Measurements showed that the Uranian rings are different from those at Jupiter and Saturn. The Uranian ring system might be relatively young, and it did not form at the same time that Uranus did. The particles that make up the rings might be the remnants of a moon that was broken up by either a high-velocity impact or torn up by tidal effects.[36] [60]

In March 2020, NASA astronomers reported the detection of a large atmospheric magnetic bubble, also known as a plasmoid, released into outer space from the planet Uranus, after reevaluating old data recorded during the flyby.[61] [62]

Encounter with Neptune

Following a mid-course correction in 1987, Voyager 2s closest approach to Neptune occurred on August 25, 1989.[63] [64] Through repeated computerized test simulations of trajectories through the Neptunian system conducted in advance, flight controllers determined the best way to route Voyager 2 through the Neptune-Triton system. Since the plane of the orbit of Triton is tilted significantly with respect to the plane of the ecliptic, through mid-course corrections, Voyager 2 was directed into a path about 4950km (3,080miles) above the north pole of Neptune.[65] Five hours after Voyager 2 made its closest approach to Neptune, it performed a close fly-by of Triton, the larger of Neptune's two originally known moons, passing within about 40000km (20,000miles).[66]

In 1989, the Voyager 2 Planetary Radio Astronomy (PRA) experiment observed around 60 lightning flashes, or Neptunian electrostatic discharges emitting energies over 7X10^8 J.[67] A plasma wave system (PWS) detected 16 electromagnetic wave events with a frequency range of 50 Hz – 12 kHz at magnetic latitudes 7˚-33˚.[68] These plasma wave detections were possibly triggered by lightning over 20 minutes in the ammonia clouds of the magnetosphere. During Voyager 2s closest approach to Neptune, the PWS instrument provided Neptune’s first plasma wave detections at a sample rate of 28,800 samples per second. The measured plasma densities range from 10^-3 – 10^-1 cm^-3.[69]

Voyager 2 discovered previously unknown Neptunian rings,[70] and confirmed six new moons: Despina, Galatea, Larissa, Proteus, Naiad and Thalassa.[71] While in the neighborhood of Neptune, Voyager 2 discovered the "Great Dark Spot", which has since disappeared, according to observations by the Hubble Space Telescope.[72] The Great Dark Spot was later hypothesized to be a region of clear gas, forming a window in the planet's high-altitude methane cloud deck.[73]

Interstellar mission

Once its planetary mission was over, Voyager 2 was described as working on an interstellar mission, which NASA is using to find out what the Solar System is like beyond the heliosphere. Voyager 2 is transmitting scientific data at about 160 bits per second.[74] Information about continuing telemetry exchanges with Voyager 2 is available from Voyager Weekly Reports.[75]

In 1992, Voyager 2 observed the nova V1974 Cygni in the far-ultraviolet, first of its kind. The further increase in the brightness at those wavelengths helped in the more detailed study of the nova.[76]

In July 1994, an attempt was made to observe the impacts from fragments of the comet Comet Shoemaker–Levy 9 with Jupiter. The craft's position meant it had a direct line of sight to the impacts and observations were made in the ultraviolet and radio spectrum. Voyager 2 failed to detect anything, with calculations showing that the fireballs were just below the craft's limit of detection.[77]

On November 29, 2006, a telemetered command to Voyager 2 was incorrectly decoded by its on-board computer—in a random error—as a command to turn on the electrical heaters of the spacecraft's magnetometer. These heaters remained turned on until December 4, 2006, and during that time, there was a resulting high temperature above 130°C, significantly higher than the magnetometers were designed to endure, and a sensor rotated away from the correct orientation.[78]

On August 30, 2007, Voyager 2 passed the termination shock and then entered into the heliosheath, approximately 1e9mi closer to the Sun than Voyager 1 did.[79] This is due to the interstellar magnetic field of deep space. The southern hemisphere of the Solar System's heliosphere is being pushed in.[80]

On April 22, 2010, Voyager 2 encountered scientific data format problems.[81] On May 17, 2010, JPL engineers revealed that a flipped bit in an on-board computer had caused the problem, and scheduled a bit reset for May 19.[82] On May 23, 2010, Voyager 2 resumed sending science data from deep space after engineers fixed the flipped bit.[83]

In 2013, it was originally thought that Voyager 2 would enter interstellar space in two to three years, with its plasma spectrometer providing the first direct measurements of the density and temperature of the interstellar plasma. But the Voyager project scientist, Edward C. Stone and his colleagues said they lacked evidence of what would be the key signature of interstellar space: a shift in the direction of the magnetic field.[84] Finally, in December 2018, Stone announced that Voyager 2 reached interstellar space on November 5, 2018.

Maintenance to the Deep Space Network cut outbound contact with the probe for eight months in 2020. Contact was reestablished on November 2, when a series of instructions was transmitted, subsequently executed, and relayed back with a successful communication message.[85] On February 12, 2021, full communications were restored after a major ground station antenna upgrade that took a year to complete.

In October 2020, astronomers reported a significant unexpected increase in density in the space beyond the Solar System as detected by the Voyager 1 and Voyager 2; this implies that "the density gradient is a large-scale feature of the VLISM (very local interstellar medium) in the general direction of the heliospheric nose".[86] [87]

On July 18, 2023, Voyager 2 overtook Pioneer 10 as the second farthest spacecraft from the Sun.[88] [89]

On July 21, 2023, a programming error misaligned Voyager 2's high gain antenna[90] 2 degrees away from Earth, breaking communications with the spacecraft. By August 1, the spacecraft's carrier signal was detected using multiple antennas of the Deep Space Network.[91] [92] A high-power "shout" on August 4 sent from the Canberra station[93] successfully commanded the spacecraft to reorient towards Earth, resuming communications.[94] As a failsafe measure, the probe is also programmed to autonomously reset its orientation to point towards Earth, which would have occurred by October 15.

Reductions in capabilities

As the power from the RTG slowly reduces, various items of equipment have been turned off on the spacecraft.[95] The first science equipment turned off on Voyager 2 was the PPS in 1991, which saved 1.2 watts.

Year End of specific capabilities as a result of the available electrical power limitations[96]
1998 Termination of scan platform and UVS observations
2007 Termination of Digital Tape Recorder (DTR) operations (It was no longer needed due to a failure on the High Waveform Receiver on the Plasma Wave Subsystem (PWS) on June 30, 2002.)[97]
2008 Power off Planetary Radio Astronomy Experiment (PRA)
2019 CRS heater turned off[98]
2021 Turn off heater for Low Energy Charged Particle instrument[99]
2023 Software update reroutes power from the voltage regulator to keep the science instruments operating[100]
2030 approx Can no longer power any instrument[101]
2036 Out of range of the Deep Space Network[102]

Concerns with the orientation thrusters

Some thrusters needed to control the correct attitude of the spacecraft and to point its high-gain antenna in the direction of Earth are out of use due to clogging problems in their hydrazine injector. The spacecraft no longer has backups available for its thruster system and "everything onboard is running on single-string" as acknowledged by Suzanne Dodd, Voyager project manager at JPL, in an interview with Ars Technica.[103] NASA has decided to patch the computer software in order to modify the functioning of the remaining thrusters to slow down the clogging of the small diameter hydrazine injector jets. Before uploading the software update on the Voyager 1 computer, NASA will first try the procedure with Voyager 2, which is closer to Earth.

Future of the probe

The probe is expected to keep transmitting weak radio messages until at least the mid-2020s, more than 48 years after it was launched.[104] NASA says that "The Voyagers are destined—perhaps eternally—to wander the Milky Way."[105]

Voyager 2 is not headed toward any particular star. The nearest star is 4.2 light-years away, and at 15.341 km/s, the spacecraft travels one light-year in about 19,541 years - during which time the nearby stars will also move substantially. In roughly 42,000 years, Voyager 2 will pass the star Ross 248 (10.30 light-years away from Earth) at a distance of 1.7 light-years.[106] If undisturbed for 296,000 years, Voyager 2 should pass by the star Sirius (8.6 light-years from Earth) at a distance of 4.3 light-years.[107]

Golden record

See main article: Voyager Golden Record.

Both Voyager space probes carry a gold-plated audio-visual disc, a compilation meant to showcase the diversity of life and culture on Earth in the event that either spacecraft is ever found by any extraterrestrial discoverer.[108] [109] The record, made under the direction of a team including Carl Sagan and Timothy Ferris, includes photos of the Earth and its lifeforms, a range of scientific information, spoken greetings from people such as the Secretary-General of the United Nations and the President of the United States and a medley, "Sounds of Earth", that includes the sounds of whales, a baby crying, waves breaking on a shore, and a collection of music spanning different cultures and eras including works by Wolfgang Amadeus Mozart, Blind Willie Johnson, Chuck Berry and Valya Balkanska. Other Eastern and Western classics are included, as well as performances of indigenous music from around the world. The record also contains greetings in 55 different languages.[110] The project aimed to portray the richness of life on Earth and stand as a testament to human creativity and the desire to connect with the cosmos.[111]

See also

Further reading

External links

Notes and References

  1. Web site: Voyager: Mission Information . 1989 . NASA . January 2, 2011 . https://web.archive.org/web/20170220172041/https://starbrite.jpl.nasa.gov/ds-view/pds/viewMissionProfile.jsp?MISSION_NAME=VOYAGER . February 20, 2017 . dead .
  2. Web site: Voyager 2 . US National Space Science Data Center . August 25, 2013 . January 31, 2017 . https://web.archive.org/web/20170131044213/http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1977-076A . live .
  3. Web site: Voyager 2 . NASA's Solar System Exploration website . December 4, 2022 . April 20, 2017 . https://web.archive.org/web/20170420085656/https://solarsystem.nasa.gov/missions/voyager2/indepth . live .
  4. Web site: NASA's Voyager 1 Resumes Sending Engineering Updates to Earth . 2024-06-22 . NASA/JPL . April 22, 2024 . https://web.archive.org/web/20240422174653/https://www.jpl.nasa.gov/news/nasas-voyager-1-resumes-sending-engineering-updates-to-earth . live .
  5. Web site: Voyager – Mission Status. July 9, 2023. Jet Propulsion Laboratory. National Aeronautics and Space Administration. January 1, 2018. https://web.archive.org/web/20180101025244/https://voyager.jpl.nasa.gov/mission/status/. live.
  6. Web site: Staff . Where are the Voyagers? . September 9, 2012 . . September 9, 2012 . March 10, 2017 . https://web.archive.org/web/20170310054307/http://voyager.jpl.nasa.gov/where/index.html . live .
  7. Web site: Voyager – Mission Status. voyager.jpl.nasa.gov. September 14, 2018. January 1, 2018. https://web.archive.org/web/20180101025244/https://voyager.jpl.nasa.gov/mission/status/. live.
  8. News: . Voyager 2 reaches interstellar space – Iowa-led instrument detects plasma density jump, confirming spacecraft has entered the realm of the stars . November 4, 2019 . . November 4, 2019 . April 13, 2020 . https://web.archive.org/web/20200413080722/https://www.eurekalert.org/pub_releases/2019-11/uoi-v2r103119.php . live .
  9. News: Chang . Kenneth . Voyager 2's Discoveries From Interstellar Space – In its journey beyond the boundary of the solar wind's bubble, the probe observed some notable differences from its twin, Voyager 1. . November 4, 2019 . . November 5, 2019 . April 13, 2020 . https://web.archive.org/web/20200413080724/https://www.nytimes.com/2019/11/04/science/voyager-2-interstellar-solar-wind.html . live .
  10. News: Gill . Victoria . Nasa's Voyager 2 probe 'leaves the Solar System' . December 10, 2018 . . December 10, 2018 . December 15, 2019 . https://web.archive.org/web/20191215232828/https://www.bbc.com/news/science-environment-46502820 . live .
  11. News: Brown . Dwayne . Fox . Karen . Cofield . Calia . Potter . Sean . Release 18–115 – NASA's Voyager 2 Probe Enters Interstellar Space . December 10, 2018 . . December 10, 2018 . June 27, 2023 . https://web.archive.org/web/20230627023807/https://www.nasa.gov/press-release/nasa-s-voyager-2-probe-enters-interstellar-space/ . live .
  12. News: At last, Voyager 1 slips into interstellar space – Atom & Cosmos . . September 12, 2013 . September 17, 2013 . https://web.archive.org/web/20130915214546/http://www.sciencenews.org/view/generic/id/353199/description/At_last_Voyager_1_slips_into_interstellar_space . September 15, 2013 . dead.
  13. NASA Voyager – The Interstellar Mission Mission Overview
  14. News: Shannon Stirone. Earth to Voyager 2: After a Year in the Darkness, We Can Talk to You Again – NASA's sole means of sending commands to the distant space probe, launched 44 years ago, is being restored on Friday. . https://ghostarchive.org/archive/20211228/https://www.nytimes.com/2021/02/12/science/nasa-voyager-deep-space-network.html . December 28, 2021 . limited . February 12, 2021 . . February 14, 2021 .
  15. https://voyager.jpl.nasa.gov/science/planetary.html Planetary Voyage
  16. Book: Butrica . Andrew . From Engineering Science to Big Science . 267 . September 4, 2015 . Despite the name change, Voyager remained in many ways the Grand Tour concept, though certainly not the Grand Tour (TOPS) spacecraft. . February 29, 2020 . https://web.archive.org/web/20200229064831/https://history.nasa.gov/SP-4219/Chapter11.html . live .
  17. Book: David W. Swift . Voyager Tales: Personal Views of the Grand Tour . January 1, 1997 . AIAA . 978-1-56347-252-7 . 69.
  18. Book: Jim Bell . The Interstellar Age: Inside the Forty-Year Voyager Mission . February 24, 2015 . Penguin Publishing Group . 978-0-698-18615-6 . 93.
  19. Web site: Voyager 2: Host Information . 1989 . NASA . January 2, 2011 . https://web.archive.org/web/20170220172046/https://starbrite.jpl.nasa.gov/ds-view/pds/viewHostProfile.jsp?INSTRUMENT_HOST_ID=VG2 . February 20, 2017.
  20. Web site: Ludwig . Roger . Taylor . Jim . 2013 . Voyager Telecommunications . live . August 7, 2023 . August 8, 2023 . https://web.archive.org/web/20230808014706/https://voyager.gsfc.nasa.gov/Library/DeepCommo_Chapter3--141029.pdf .
  21. Web site: NASA News Press Kit 77–136 . JPL/NASA . December 15, 2014 . May 29, 2019 . https://web.archive.org/web/20190529081627/https://forum.nasaspaceflight.com/index.php?action=dlattach;topic=9476.0;attach=591860 . live .
  22. Web site: Voyager 2 Craft Details . NASA-NSSDC-Spacecraft-Details . NASA . March 9, 2011 . January 31, 2017 . https://web.archive.org/web/20170131044213/http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1977-076A . live .
  23. Furlong . Richard R. . Wahlquist . Earl J. . 1999 . U.S. space missions using radioisotope power systems . Nuclear News . 42 . 4 . 26–34 . January 2, 2011 . October 16, 2018 . https://web.archive.org/web/20181016011258/http://www3.ans.org/pubs/magazines/nn/pdfs/1999-4-2.pdf . dead .
  24. Web site: NASA's Voyager Will Do More Science With New Power Strategy . NASA Jet Propulsion Laboratory . April 28, 2023 . April 27, 2023 . https://web.archive.org/web/20230427182016/https://www.jpl.nasa.gov/news/nasas-voyager-will-do-more-science-with-new-power-strategy . live .
  25. Web site: MR-103 . https://web.archive.org/web/20161228025700/http://astronautix.com/m/mr-103.html . dead . December 28, 2016 . Astronautix.com . December 11, 2018.
  26. Voyager Backgrounder . Nasa.gov . October 1980 . Nasa . December 11, 2018 . June 9, 2019 . https://web.archive.org/web/20190609064757/https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19810001583.pdf#page=21 . live .
  27. Web site: Koerner . Brendan . What Fuel Does Voyager 1 Use? . Slate.com . December 11, 2018 . November 6, 2003 . December 11, 2018 . https://web.archive.org/web/20181211192625/https://slate.com/news-and-politics/2003/11/what-voyager-1-uses-for-fuel.html . live .
  28. Web site: Voyager 1 Narrow Angle Camera Description . January 17, 2011 . NASA/JPL . August 26, 2003 . NASA / PDS . October 2, 2011 . https://web.archive.org/web/20111002061657/http://pds-rings.seti.org/voyager/iss/inst_cat_na2.html#filters . live .
  29. Web site: Voyager 1 Wide Angle Camera Description . January 17, 2011 . NASA/JPL . August 26, 2003 . NASA / PDS . August 11, 2011 . https://web.archive.org/web/20110811232308/http://pds-rings.seti.org/voyager/iss/inst_cat_wa2.html#filters . live .
  30. http://www.dmuller.net/spaceflight/mission.php?mission=voyager2&appear=black&showimg=yes "Voyager 2 Full Mission Timeline"
  31. https://pds-rings.seti.org/voyager/mission/ "Voyager Mission Description"
  32. https://starbrite.jpl.nasa.gov/ds-view/pds/viewMissionProfile.jsp?MISSION_NAME=VOYAGER "JPL Mission Information"
  33. News: Voyager 2 to Switch to Backup Thruster Set . November 5, 2011 . Rosemary . Sullivant . 2011-341 . JPL . October 5, 2018 . February 26, 2021 . https://web.archive.org/web/20210226001915/https://www.jpl.nasa.gov/news/news.cfm?release=2011-341&rn=news.xml&rst=3189 . dead .
  34. Web site: Distance between the Sun and Voyager 2. live. https://web.archive.org/web/20230709162418/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27Sun%27&START_TIME=%272023-07-01%27&STOP_TIME=%272023-08-01%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720%27&CENTER=%27500@-32%27. July 9, 2023. July 18, 2023.
  35. Web site: Distance between the Sun and Pioneer 10. live. https://web.archive.org/web/20230714212211/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27Sun%27&START_TIME=%272023-07-01%27&STOP_TIME=%272023-08-01%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720%27&CENTER=%27500@-23%27. July 14, 2023. July 18, 2023.
  36. Web site: Voyager - Fact Sheet . June 9, 2024 . NASA/JPL . April 13, 2020 . https://web.archive.org/web/20200413080739/https://voyager.jpl.nasa.gov/frequently-asked-questions/fact-sheet/ . live .
  37. Web site: Voyager - Fast Facts . June 9, 2024 . NASA/JPL . May 22, 2022 . https://web.archive.org/web/20220522131332/https://voyager.jpl.nasa.gov/frequently-asked-questions/fast-facts/ . live .
  38. https://ssd.jpl.nasa.gov/horizons.cgi HORIZONS
  39. Web site: 40 Years Ago: Voyager 2 Explores Jupiter – NASA . April 4, 2024 . July 8, 2019 . April 4, 2024 . https://web.archive.org/web/20240404165002/https://www.nasa.gov/history/40-years-ago-voyager-2-explores-jupiter/ . live .
  40. Book: Littmann, Mark . Planets Beyond: Discovering the Outer Solar System . 2004 . . 106 . 978-0-486-43602-9.
  41. Voyage to the tilted planet . Davies . John . January 23, 1986 . 42 . New Scientist .
  42. Web site: History . www.jpl.nasa.gov . October 5, 2018 . April 16, 2022 . https://web.archive.org/web/20220416064548/https://www.jpl.nasa.gov/history/70s/Voyager2_1979.htm . dead .
  43. Web site: Voyager Mission Description . 2024-06-22 . pdsseti . October 7, 2018 . https://web.archive.org/web/20181007014859/https://pds-rings.seti.org/voyager/mission/#v2_jupiterencounter . live .
  44. National Aeronautics and Space Administration "Voyager 2" NASA Science: Solar System Exploration. Updated January 26, 26, 2018. Accessed December 12, 2018.
  45. Web site: Voyager Fact Sheet . JPL . December 11, 2018 . April 13, 2020 . https://web.archive.org/web/20200413080739/https://voyager.jpl.nasa.gov/frequently-asked-questions/fact-sheet/ . live .
  46. Web site: Voyager – Fact Sheet . June 9, 2024 . NASA/JPL . April 13, 2020 . https://web.archive.org/web/20200413080739/https://voyager.jpl.nasa.gov/frequently-asked-questions/fact-sheet/ . live .
  47. Web site: Voyager – Fast Facts . June 9, 2024 . NASA/JPL . May 22, 2022 . https://web.archive.org/web/20220522131332/https://voyager.jpl.nasa.gov/frequently-asked-questions/fast-facts.
  48. Web site: NASA – NSSDCA – Master Catalog – Event Query . nssdc.gsfc.nasa.gov . October 5, 2018 . March 26, 2019 . https://web.archive.org/web/20190326020912/https://nssdc.gsfc.nasa.gov/nmc/EventQuery.jsp . live .
  49. Web site: Saturn Approach . . September 8, 2023 . https://web.archive.org/web/20230809220343/https://voyager.jpl.nasa.gov/mission/science/saturn/ . August 9, 2023 . live.
  50. Laeser . Richard P. . . Engineering the voyager uranus mission . . 1987 . 16 . 75–82 . 10.1016/0094-5765(87)90096-8 . September 8, 2023 . 1986inns.iafcQ....L.
  51. Web site: Jet Propulsion Laboratory . JPL . Lesson 394: Voyager Scan Platform Problems . NASA Public Lessons Learned System . . September 8, 2023 . https://web.archive.org/web/20230908075606/https://llis.nasa.gov/lesson/394 . September 8, 2023 . May 30, 1995 . live.
  52. Book: Bell, Jim. The Interstellar Age: Inside the Forty-Year Voyager Mission. February 24, 2015. Penguin Publishing Group. 978-0-698-18615-6. 93. live. https://web.archive.org/web/20160904191620/https://books.google.com/books?id=KXPoAwAAQBAJ&pg=PT93. September 4, 2016.
  53. https://voyager.jpl.nasa.gov/mission/science/uranus/ "Uranus Approach"
  54. 10.1088/0034-4885/56/6/001 . Planetary magnetospheres . Reports on Progress in Physics . 56 . 6 . 687–732 . 1993 . Russell . C. T. . 1993RPPh...56..687R. 250897924 .
  55. Aplin . K.L. . Fischer . G. . Nordheim . T.A. . Konovalenko . A. . Zakharenko . V. . Zarka . P.. Atmospheric Electricity at the Ice Giants . Space Science Reviews . 2020 . 216 . 2 . 26 . 10.1007/s11214-020-00647-0 . 1907.07151 . 2020SSRv..216...26A .
  56. Zarka . P. . Pederson . B.M. . Radio detection of uranian lightning by Voyager 2 . Nature . 1986 . 323 . 6089 . 605-608 . 10.1038/323605a0 . 1986Natur.323..605Z .
  57. Aglyamov . Y.S. . Lunine . J. . Atreya . S. . Guillot . T. . Becker . H.N. . Levin . S.. Bolton . S.J. . Atmospheric Electricity at the Ice Giants . Space Science Reviews . 2020 . 216 . 2 . 10.1007/s11214-020-00647-0 . 1907.07151 . 2020SSRv..216...26A .
  58. Elizabeth Landau (2016) "Voyager Mission Celebrates 30 Years Since Uranus" National Aeronautics and Space Administration, January 22, 2016. Accessed December 11, 2018
  59. Voyager 2 Mission Team (2012) "1986: Voyager at Uranus" NASA Science: Solar System Exploration, December 14, 2012. Accessed December 11, 2018.
  60. Web site: Voyager - Fast Facts . June 9, 2024 . NASA/JPL . May 22, 2022 . https://web.archive.org/web/20220522131332/https://voyager.jpl.nasa.gov/frequently-asked-questions/fast-facts.
  61. News: Hatfield . Miles . Revisiting Decades-Old Voyager 2 Data, Scientists Find One More Secret – Eight and a half years into its grand tour of the solar system, NASA's Voyager 2 spacecraft was ready for another encounter. It was Jan. 24, 1986, and soon it would meet the mysterious seventh planet, icy-cold Uranus. . March 25, 2020 . . March 27, 2020 . March 27, 2020 . https://web.archive.org/web/20200327030510/https://www.nasa.gov/feature/goddard/2020/revisiting-decades-old-voyager-2-data-scientists-find-one-more-secret . live .
  62. News: Andrews . Robin George . Uranus Ejected a Giant Plasma Bubble During Voyager 2's Visit – The planet is shedding its atmosphere into the void, a signal that was recorded but overlooked in 1986 when the robotic spacecraft flew past. . March 27, 2020 . . March 27, 2020 . March 27, 2020 . https://web.archive.org/web/20200327215013/https://www.nytimes.com/2020/03/27/science/uranus-bubble-voyager.html . live .
  63. News: Voyager Steered Toward Neptune . December 6, 2017 . Ukiah Daily Journal . March 15, 1987 . December 7, 2017 . https://web.archive.org/web/20171207085743/http://www.newspapers.com/image/555835/ . live .
  64. Web site: Fact Sheet . JPL . March 3, 2016 . November 29, 2016 . https://web.archive.org/web/20161129230752/http://voyager.jpl.nasa.gov/news/factsheet.html . live .
  65. Web site: Neptune . Jet Propulsion Laboratory . March 3, 2016 . March 4, 2016 . https://web.archive.org/web/20160304090349/http://voyager.jpl.nasa.gov/science/neptune.html . live .
  66. [National Aeronautics and Space Administration]
  67. Borucki . W.J. . Predictions of lightning activity at Neptune . Geophysical Research Letters . 1989 . 16 . 8 . 937-939 . 10.1029/gl016i008p00937. 1989GeoRL..16..937B .
  68. Whistlers in Neptune's magnetosphere: Evidence of atmospheric lightning . Journal of Geophysical Research: Space Physics . 1990 . 95 . 20967-20976 . 10.1029/ja095ia12p20967. 1990JGR....9520967G . 2060/19910002329 . free . Gurnett . D. A. . Kurth . W. S. . Cairns . I. H. . Granroth . L. J. . A12 .
  69. Belcher . J.W. . Bridge . H.S. . Bagenal . F. . Coppi . B. . Divers . O. . Eviatar . A. . Gordon . G.S. . Lazarus . A.J. . McNutt . R.L. . Ogilvie . K.W. . Richardson . J.D. . Siscoe . G.L. . Sittler . E.C. . Steinberg . J.T. . Sullivan . J.D. . Szabo . A. . Villanueva . L. . Vasyliunas . V.M. . Zhang . M. . Plasma observations near Neptune: Initial results from Voyager 2 . Science . 1989 . 246 . 4936 . 1478–1483 . 10.1126/science.246.4936.1478 . 17756003 . 1989Sci...246.1478B .
  70. [National Aeronautics and Space Administration]
  71. Elizabeth Howell (2016) "Neptune's Moons: 14 Discovered So Far" Space.com, June 30, 2016. Accessed December 12, 2018.
  72. Phil Plait (2016) "Neptune Just Got a Little Dark" Slate, June 24, 2016. Accessed December 12, 2018.
  73. [National Aeronautics and Space Administration]
  74. Web site: Voyager Space Flight Operations Schedule . Voyager Mission Status . . September 8, 2023 . https://web.archive.org/web/20230908082427/https://voyager.jpl.nasa.gov/pdf/sfos2023pdf/23_09_07-23_09_25.sfos.pdf . September 8, 2023 . September 7, 2023 . live.
  75. Web site: Voyager Weekly Reports . Voyager.jpl.nasa.gov . September 6, 2013 . September 14, 2013 . September 21, 2013 . https://web.archive.org/web/20130921055929/http://voyager.jpl.nasa.gov/mission/weekly-reports/index.htm . live .
  76. V1974 Cygni 1992: The Most Important Nova of the Century . June 9, 2024 . May 6, 2023 . https://web.archive.org/web/20230506063436/https://quantummechanics.ucsd.edu/ph87/ScientificAmerican/sciam_magnificant-cosmos/nova-of-century.pdf . live .
  77. Book: Ulivi . Paolo . Harland . David M . 2007 . Robotic Exploration of the Solar System Part I: The Golden Age 1957–1982 . Springer . 449 . 978-0-387-49326-8.
  78. Book: Shuai, Ping. Understanding Pulsars and Space Navigations. Springer Singapore. 2021. 9789811610677. 189. March 20, 2023. April 5, 2023. https://web.archive.org/web/20230405145758/https://books.google.com/books?id=ewcqEAAAQBAJ&pg=PA189. live.
  79. Web site: NASA – Voyager 2 Proves Solar System Is Squashed . www.nasa.gov . October 5, 2018 . April 13, 2020 . https://web.archive.org/web/20200413080741/https://www.nasa.gov/mission_pages/voyager/voyager-20071210.html . live .
  80. https://www.reuters.com/article/scienceNews/idUSN1044867120071211 Voyager 2 finds solar system's shape is 'dented' # 2007-12-10, Week Ending December 14, 2007.
  81. News: NASA working on Voyager 2 data problem . John Antczak . May 6, 2010 . Associated Press . October 5, 2018 . March 5, 2016 . https://web.archive.org/web/20160305012426/http://www.boston.com/news/nation/articles/2010/05/06/nasa_working_on_voyager_2_data_problem/ . live .
  82. Web site: Engineers Diagnosing Voyager 2 Data System . . May 17, 2010 . June 12, 2010 . https://web.archive.org/web/20100612222643/http://www.jpl.nasa.gov/news/news.cfm?release=2010-151 . dead .
  83. Web site: NASA Fixes Bug On Voyager 2 . May 25, 2010 . May 27, 2010 . https://web.archive.org/web/20100527134927/http://www.space-travel.com/reports/NASA_Fixes_Bug_On_Voyager_2_999.html . live .
  84. News: At last, Voyager 1 slips into interstellar space – Atom & Cosmos . Science News . September 12, 2013 . September 17, 2013 . https://web.archive.org/web/20130915214546/http://www.sciencenews.org/view/generic/id/353199/description/At_last_Voyager_1_slips_into_interstellar_space . September 15, 2013 . dead.
  85. News: Dockrill. Peter. November 5, 2020. NASA finally makes contact with Voyager 2 after longest radio silence in 30 years. Live Science. November 5, 2020. November 5, 2020. https://web.archive.org/web/20201105133231/https://www.livescience.com/nasa-makes-contact-voyager-2-long-radio-silence.html. live.
  86. News: Starr . Michelle . Voyager Spacecraft Detect an Increase in The Density of Space Outside The Solar System . October 19, 2020 . . October 19, 2020 . October 19, 2020 . https://web.archive.org/web/20201019133221/https://www.sciencealert.com/for-some-reason-the-density-of-space-is-higher-just-outside-the-solar-system . live .
  87. Kurth . W.S. . Gurnett . D.A. . Observations of a Radial Density Gradient in the Very Local Interstellar Medium by Voyager 2 . August 25, 2020 . . 900 . 1 . L1 . 10.3847/2041-8213/abae58 . 2020ApJ...900L...1K . 225312823 . free .
  88. Web site: Distance between the Sun and Voyager 2 . July 18, 2023 . July 9, 2023 . https://web.archive.org/web/20230709162418/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27Sun%27&START_TIME=%272023-07-01%27&STOP_TIME=%272023-08-01%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720%27&CENTER=%27500%40-32%27 . live .
  89. Web site: Distance between the Sun and Pioneer 10 . July 18, 2023 . July 14, 2023 . https://web.archive.org/web/20230714212211/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27Sun%27&START_TIME=%272023-07-01%27&STOP_TIME=%272023-08-01%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720%27&CENTER=%27500%40-23%27 . live .
  90. Web site: Inskeep . Steve . August 2, 2023 . NASA loses contact with Voyager Two after a programming error on Earth . August 2, 2023 . January 15, 2023 . NPR . https://web.archive.org/web/20230802093328/https://www.npr.org/2023/08/02/1191519686/nasa-loses-contact-with-voyager-two-after-a-programming-error-on-earth . live .
  91. News: August 1, 2023 . Voyager 2: Nasa picks up 'heartbeat' signal after sending wrong command . en-GB . BBC News . August 2, 2023 . August 2, 2023 . https://web.archive.org/web/20230802095458/https://www.bbc.com/news/world-66371569 . live .
  92. Web site: July 28, 2023 . Mission Update: Voyager 2 Communications Pause – The Sun Spot . July 29, 2023 . blogs.nasa.gov . en-US . July 29, 2023 . https://web.archive.org/web/20230729144934/https://blogs.nasa.gov/sunspot/2023/07/28/mission-update-voyager-2-communications-pause/ . live .
  93. News: Ellen Francis. August 5, 2023. 'Interstellar shout' restores NASA contact with lost Voyager 2 spacecraft. Washington Post. August 5, 2023. August 5, 2023. https://web.archive.org/web/20230805134746/https://www.washingtonpost.com/technology/2023/08/05/nasa-voyager2-contact-interstellar-shout/. live.
  94. News: August 4, 2023 . Voyager 2: Nasa fully back in contact with lost space probe . en-GB . BBC News . August 4, 2023 . August 4, 2023 . https://web.archive.org/web/20230804215149/https://www.bbc.com/news/science-environment-66408851 . live .
  95. Web site: Voyager – Operations Plan to the End Mission . voyager.jpl.nasa.gov . en . September 20, 2019 . September 10, 2020 . https://web.archive.org/web/20200910162755/https://voyager.jpl.nasa.gov/mission/science/thirty-year-plan/ . live .
  96. Web site: Voyager – The Spacecraft . voyager.jpl.nasa.gov . October 5, 2018 . March 1, 2017 . https://web.archive.org/web/20170301102317/http://voyager.jpl.nasa.gov/spacecraft/spacecraftlife.html . live .
  97. Web site: Voyager – Interstellar Science . December 2, 2009 . December 1, 2009 . . March 1, 2017 . https://web.archive.org/web/20170301102317/http://voyager.jpl.nasa.gov/spacecraft/spacecraftlife.html . live .
  98. Web site: A New Plan for Keeping NASA's Oldest Explorers Going. NASA/JPL. January 2, 2020. April 13, 2020. https://web.archive.org/web/20200413080726/https://www.jpl.nasa.gov/news/news.php?feature=7446. live.
  99. News: Earth to Voyager 2: After a Year in the Darkness, We Can Talk to You Again. The New York Times. February 12, 2021. February 12, 2021. Stirone. Shannon. February 12, 2021. https://web.archive.org/web/20210212100818/https://www.nytimes.com/2021/02/12/science/nasa-voyager-deep-space-network.html. live.
  100. Web site: NASA's Voyager Will Do More Science With New Power Strategy. NASA/JPL. May 1, 2023. April 30, 2023. https://web.archive.org/web/20230430184553/https://www.jpl.nasa.gov/news/nasas-voyager-will-do-more-science-with-new-power-strategy. live.
  101. Record-Breaking Voyager Spacecraft Begin to Power Down. Scientific American. July 2022. 10.1038/scientificamerican0722-26. 39016957 . August 14, 2023. June 23, 2022. https://web.archive.org/web/20220623222423/https://www.scientificamerican.com/article/record-breaking-voyager-spacecraft-begin-to-power-down/. live . Folger . T. . 327 . 1 . 26 .
  102. Web site: Voyager – Frequently Asked Questions. Jet Propulsion Laboratory. December 11, 2018. August 13, 2023. https://web.archive.org/web/20230813133216/https://voyager.jpl.nasa.gov/frequently-asked-questions/. live.
  103. Web site: Clark . Stephen . NASA wants the Voyagers to age gracefully, so it's time for a software patch . Ars Technica . October 24, 2023 . October 27, 2023 . October 27, 2023 . https://web.archive.org/web/20231027215228/https://arstechnica.com/space/2023/10/nasa-wants-the-voyagers-to-age-gracefully-so-its-time-for-a-software-patch/ . live .
  104. Web site: Voyager – Spacecraft – Spacecraft Lifetime . May 25, 2008 . March 15, 2008 . . March 1, 2017 . https://web.archive.org/web/20170301102317/http://voyager.jpl.nasa.gov/spacecraft/spacecraftlife.html . live .
  105. Web site: Future . live . https://web.archive.org/web/20120514175011/http://voyager.jpl.nasa.gov/mission/interstellar.html . May 14, 2012 . October 13, 2013 . NASA.
  106. Future stellar flybys of the Voyager and Pioneer spacecraft . Research Notes of the AAS . 3 . 4 . 59 . April 3, 2019 . 10.3847/2515-5172/ab158e . Bailer-Jones . Coryn A. L. . Farnocchia . Davide . 2019RNAAS...3...59B. 1912.03503 . 134524048 . free .
  107. News: Baldwin . Paul . NASA's Voyager 2 heads for star Sirius... by time it arrives humans will have died out . September 1, 2022 . Express.co.uk . December 4, 2017 . en . September 1, 2022 . https://web.archive.org/web/20220901052903/https://www.express.co.uk/news/world/567957/NASA-s-Voyager-2-sets-course-for-star-Sirius-by-time-it-arrives-human-race-will-be-dead . live .
  108. Ferris . Timothy . May 2012 . Timothy Ferris on Voyagers' Never-Ending Journey . dead . https://web.archive.org/web/20131104221550/http://www.smithsonianmag.com/science-nature/Timothy-Ferris-on-Voyagers-Never-Ending-Journey.html . November 4, 2013 . August 19, 2013 . Smithsonian Magazine.
  109. Web site: Gambino . Megan . What Is on Voyager's Golden Record? . January 15, 2024 . Smithsonian Magazine . en . April 8, 2020 . https://web.archive.org/web/20200408014620/https://www.smithsonianmag.com/science-nature/what-is-on-voyagers-golden-record-73063839/ . live .
  110. Web site: Voyager Golden record . live . https://web.archive.org/web/20110927062632/http://voyager.jpl.nasa.gov/spacecraft/goldenrec.html/ . September 27, 2011 . August 18, 2013 . JPL.
  111. Ferris . Timothy . August 20, 2017 . How the Voyager Golden Record Was Made . January 15, 2024 . The New Yorker . en-US . 0028-792X . January 15, 2024 . https://web.archive.org/web/20240115000108/https://www.newyorker.com/tech/annals-of-technology/voyager-golden-record-40th-anniversary-timothy-ferris . live .

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