How do we see a black hole ?

Answer 1

Obviously we cannot see a black hole, however we can see a black hole's effects. The material falling into a black hole will glow, a black hole can block stars behind it, or a lensing effect can occur from the gravity (which is not trapped).

Answer 2

a black hole has so much gravity that it does not reflect light.
hence we can't see it.
but we can know if a black hole is there or not.
whenever a black hole is engulfing the material of a nearby star or planet, it sends out x-rays at the event horizon.
these can be detected and analysis can show it as black hole.
event horizon is the limit after which nothing can return from black hole--not even light.

Answer 3

We can't. It's because that the gravity of the black hole is so strong that not even light can escape it. But we can "see" a black hole be spectroscopy or by seeing a lack of space objects in that area.

Answer 4

We see the radiation emitted from the black hole. Infra-red.

Answer 5

Hi. First of all it's a black sphere with an intense gravitational field. Stars in the background would have their locations distorted. Material in close orbit would heat up to intense temperatures, glowing in radiation up to and including X-rays.

Answer 6

the hole might be black, but it sucks in light so you see red