Cygnus X-1 is a galactic X-ray source located in the northern constellation Cygnus. The X-ray source is believed to be a stellar mass black hole, one created from the collapse of a massive star about 5 to 6 million years ago. It is one of the strongest sources of X-ray emissions discovered and was the first X-ray source that was widely accepted to be a black hole candidate.
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The radio source consists of the supernova remnant Sagittarius A East, the spiral structure Sagittarius A West, and a bright compact radio source at the centre of the spiral structure, called Sagittarius A*.
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NGC 1277 is a lenticular galaxy located in Perseus constellation. It lies at a distance of about 220 million light years from Earth.
The galaxy has an apparent visual magnitude of 14.7. It is notable for having an extremely heavy supermassive black hole at its centre, one of the largest black holes ever found.
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