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A black hole is a region in space where gravity is so intense that not even light can get out. The gravity is so strong because matter has been squeezed into a tiny space. With no light getting out, the black holes are invisible to the naked eye. The black hole, Sagittarius A*, is at the center of the Milky Way galaxy.

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NASA says the smallest black holes can be as small as an atom but still have the mass of a mountain. The biggest can have the mass of one million stars or more, and are called "supermassive." Sagittarius A* has the mass of about four and a half million Suns. There is a supermassive black hole at the center of every galaxy.

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Space telescopes, like Chandra X-Ray Observatory, use special tools find black holes. They use the heat signature surrounding the black hole that is caused from the matter being heated to millions of degrees as it is being pulled into the black hole, creating an X-ray.

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Scientists have noticed odd flares coming from Sagittarius A* about once a day. The cause for the flares is asteroids or comets moving too close to the black hole and being vaporized.

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Click to see summary on Sagittarius A*

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A Picture of a Flare On Sagittarius A* Taken By Chandra X-Ray Observatory

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A Picture of a Flare On Sagittarius A* Taken By Chandra X-Ray Observatory

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The largest X-ray flare from the Milky Way galaxy.