| Planetarium | |
| Cover: | Otsuka_ai_planetarium_cd.jpg |
| Type: | single |
| Artist: | Ai Otsuka |
| Album: | Love Cook |
| Recorded: | 2005 |
| Genre: | Pop |
| Label: | avex trax AVCD-30768/B (Japan, CD+DVD) AVCD-30769 (Japan, CD) |
| Prev Title: | Neko ni Fūsen |
| Prev Year: | 2005 |
| Next Title: | Frienger |
| Next Year: | 2006 |
is Ai Otsuka's tenth single, which was released on 21 September 2005. The single had great success and became Otsuka's second #1 hit on the Oricon charts, selling 316,425 copies. In 2005, Planetarium sold 215,114 copies, making it the #41 best-selling single of the year.[1] However, it still charted into the next year and was the #99 best-selling single in 2006, selling 100,555 copies. Planetarium is her second best-selling single after "Sakuranbo."[2]
"Planetarium" was featured on Ai Otsuka's studio-album Love Cook. It was also used as an OST for the Japanese drama Hana Yori Dango.