Because they do not emit light, it's impossible for astronomers to determine whether black holes really exist.

Question

Quizplus · Accepted Answer

While black holes themselves do not emit light, their presence can be inferred by observing their effects on surrounding matter, such as the stars orbiting them or the radiation emitted as matter falls into the black hole. This allows astronomers to infer the existence of black holes without directly observing them.

Because They Do Not Emit Light, It's Impossible for Astronomers