Black Holes
1- There are currently 14 known black holes.2- Astronomers think that at least one black hole is born every day.
3- The closest known black hole to Earth is Cygnus X-1, which is located about 8000 light years away.
4- There is a black hole at the centre of our own Milky way Galaxy, around which the solar system revolves. It is named Sagittarius A*
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