What can we detect from matter that has crossed an event horizon?
A)gamma-ray bursts
B)radio waves if the matter was traveling fast enough
C)visible light
D)X-rays if the matter was dense
E)nothing

Question

Quizplus · Accepted Answer

Once matter crosses the event horizon of a black hole, it is impossible for any information or energy to escape. This means that we cannot detect anything from matter that has crossed the event horizon, making option E the correct answer. Once matter has crossed the event horizon, we can no longer detect any signals or information from it. This is because the gravity is so strong that even light cannot escape, making the region within the event horizon completely dark and invisible from the outside world.

What Can We Detect from Matter That Has Crossed an Event