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Read this excerpt from "Why Are They Called Black Holes?"

Black holes are invisible because they have so much gravity that nothing escapes. Not even light can escape or bounce off. So how do scientists know that black holes exist if they are invisible?

Gravity is caused by matter, and as matter increases, the pull of gravity increases too. Stars are born when enough matter collects that gravity makes it collapse into a hot, dense protostar.

According to the introduction, why are black holes invisible?

Scientists can not figure out why they exist.
Gravity is caused by matter.
They have so much gravity that nothing escapes.
Stars are created first.

Sagot :

Black holes have so much gravity that nothing escapes.

what are Black Holes?

A black hole is a region of spacetime where gravity is so strong that nothing – no particles or even electromagnetic waves can escape from it

Anything is visible to us if light or electromagnetic waves  gets reflected and bounce back from them.

Since black holes are formed when enough matter collects that gravity makes it collapse hence black holes have immense gravity so electromagnetic waves also does not get reflected back and it becomes a black hole  Scientist can detect them by watching their influence on nearby stars and gases.

know more about black holes here

https://brainly.com/question/22983860

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Answer: C

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