What is the main challenge astronomers face when trying to directly detect black holes?(1 point)

The main challenge astronomers face when trying to directly detect black holes is that **black holes trap all light.** Because their gravitational pull is so strong that not even light can escape, they cannot be observed directly. Instead, astronomers typically infer their presence by observing the effects of their gravity on nearby objects or by detecting the radiation emitted by material as it falls into them.