With the help of NASA's observatory, scientists discovered 400 hidden black holes, let's know...

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Our universe as we know it is full of many mysteries, out of which black hole is the most unique thing.

Astronomers have discovered more than 400 black holes at the center of the Milky Way, 

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which swallow up stars and dust. These black holes were not seen before today.

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The mass of a black hole is more than a billion times the mass of the Sun.

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Some of these black holes absorb radiation and some black holes are hidden under dust and gas.

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Not all black holes are the same size. The size of every black hole is different.

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These black holes can range in size from very small to the massive dame at the center of the Milky Way.

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Whether these black holes are big or small, the whole universe can be hidden inside each of them.

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