Scientists commonly use size comparison in relation to the most massive thing close to the Earth which is the Sun which is called a "solar mass". The size comparison breaks down however when talking about black holes because black holes can be up to 21,000,000,000x (21 billion) more massive than our Sun. The super massive black hole at the centre of our Milky Way galaxy is called Sagittarius A Star and weighs in at 4,000,000 solar masses but in relation to other more distant black holes, it is e...
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