Hypothetical black hole explained

Hypothetical black hole may refer to:

• Micro black hole, a microscopic black hole proposed to have formed in the early universe
• Intermediate mass black hole, a black hole of a mass between a stellar mass black hole and a supermassive black hole
• Direct collapse black hole: a black hole formed from the collapse of hydrogen, rather than from a star
• Primordial black hole, a black hole that might have formed in a similar fashion to a star during the Universe's earliest epochs
• Extremal black hole, the smallest possible black hole that could exist while rotating at a specific speed
• White hole, the opposite of a black hole; a white hole continuously expels matter