what is black hole ? give with examples .
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One such supermassive black hole, Sagittarius A*, exists at the centre of the Milky Way Galaxy. Observations of stars orbiting the position of Sagittarius A* demonstrate the presence of a black hole with a mass equivalent to 4,154,000 Suns. Supermassive black holes have been detected in other galaxies as well.
In 2011, scientists discovered the largest black holes known in two nearby galaxies. One of these galaxies, known as NGC 3842 — the brightest galaxy in the Leo cluster nearly 320 million light years away — has a central black hole containing 9.7 billion solar masses.
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