The main challenge astronomers face when trying to directly detect black holes is that black holes trap all light. Black holes are known for their immense gravitational pull, which is so strong that nothing, including light, can escape from them once it crosses a certain point called the event horizon. This means that black holes do not emit any light themselves, making it extremely difficult for astronomers to directly detect them using traditional methods of observing light. Instead, astronomers have to rely on indirect evidence such as the gravitational effects black holes have on nearby objects or the radiation emitted by material falling into a black hole.
