Question

what conclusion can be drawn about why black holes are invisible? special telescopes are needed to view black holes. blacks holes blend into the blackness of space, so we cannot see them. the radio energy that black holes emit is not visible to our eyes.

Explanation:

Black holes are invisible because they do not emit light in the visible - spectrum. Instead, they emit radio energy which is not visible to the human eye. Special telescopes detect other effects related to black holes like gravitational lensing, not by directly seeing the black hole itself. And it's not about blending into space's blackness in a simple sense.

Answer:

The radio energy that black holes emit is not visible to our eyes.