2 Answers

  1. The short answer is that stars called “black Holes” are so massive that they don't let light particles escape from their surfaces. And we see (or rather, do not see at all) this object as a bottomless black hole.

  2. Because this object has a mass at which the light from the object in the “black hole” cannot leave it (the theory of the existence of “Hawking radiation” appeared later than the name “black hole”was coined). Therefore, we can “see” a black hole only indirectly, due to its interaction with other objects), but it does not emit light itself.

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