Question

why it is not possible to directly observe or photograph a black hole? view available hint(s) hint 1. why are black holes invisible? their gravity is so strong that nothing, not even light, can escape a black hole. they are blocked by other objects. they are very small. they are very massive.

Explanation:

Black holes have extremely strong gravitational fields. According to the theory of general relativity, this gravitational pull is so intense that not even light can escape from within the event - horizon of a black hole. Since we see objects because of the light they emit or reflect, without light coming from a black hole, it cannot be directly observed or photographed.

Answer:

The gravity is so strong that nothing, not even light, can escape a black hole.