2 years, 11 months ago
How many massive black holes have been observed in the Universe?
How many stellar units are these black holes?
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M$1 Answer
Massive black holes are thought to exist at the center of many/most/all galaxies. Let's define "massive" as >100,000 solar masses.
Sagittarius A at the center of our own run-of-the-mill galaxy is thought to be 4,000,000 solar masses.
If all galaxies have a massive black hole at their center, that means there are probably a minimum of 250,000,000,000 massive black holes in the universe.
How many have been directly observed: none.
How many do we have very good evidence for (other than the obvious presence of a galaxy): a handful.
Sagittarius A at the center of our own run-of-the-mill galaxy is thought to be 4,000,000 solar masses.
If all galaxies have a massive black hole at their center, that means there are probably a minimum of 250,000,000,000 massive black holes in the universe.
How many have been directly observed: none.
How many do we have very good evidence for (other than the obvious presence of a galaxy): a handful.
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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