Main Question or Discussion Point
What makes black hole so heavy even it's tiny in size?
Blackholes can't be seen directly, because light cannot escape them. They are detected from the X-rays that the accretion disks they form. When material falls into a black hole from a companion star, it gets heated to millions of degrees Kelvin and accelerated. The superheated materials emit X-rays, which can be detected by X-ray telescopes such as the orbiting Chandra X-ray Observatory. The star Cygnus X-1 is a strong X-ray source and is considered to be a good candidate for a black hole. Stellar winds from the companion star, blow material onto the accretion disk surrounding the black hole. As this material falls into the black hole, it emits X-rays.kiru said:Do you mean that the black hole is perfectly black?