How Big Are Black Holes?
Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter in an object.
The largest black holes are called "supermassive." These black holes have masses that are more than 1 million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The supermassive black hole at the center of the Milky Way galaxy is called Sagittarius A. It has a mass equal to about 4 million suns.
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Black holes are particles which have huge gravitational power, almost 1000 times that of the earth or any other planet. Scientists say that if you put anything in front of a black hole, it's going to suck that thing immediately, within a fraction of seconds.
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NASA is using sattelites and telescopes that are traveling in space to learn more about black holes.
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