What is a Black Hole

A black hole is a place in space where gravity pulls so much that even light can’t get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying.
Because no light can get out, people can’t see black holes. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars.
One of the strangest objects in the universe is the burnt out remnant of a large star, known as a black hole. The name comes from the fact that the star collapses into itself, becoming so dense that its gravitational pull keeps even light from escaping. Therefore, if light can’t get out, then nothing that ever enters the black hole would ever escape.
Rockets to the moon or Mars need to achieve what is called ‘escape velocity’, the speed necessary to overcome the Earth’s gravity. However, since nothing can ever go faster than the speed of light, nothing could ever go fast enough to reach the ‘escape velocity’ necessary to pull out of a black hole.
Here’s how dense a black hole is: The Sun has a diameter of about 864,000 miles(1,390,000 km), for it to be as dense as a black hole, it’s entire mass would have to be squeezed down to a ball less than 2 miles across.
Aaron Walsh 4th Class

Category: English, Explanation
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