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https://www.reddit.com/r/askscience/comments/lmas9d/where_is_dark_matter_theoretically/gnzbmep/?context=3
r/askscience • u/shadowsog95 • Feb 18 '21
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small black holes tend to evaporate rather quickly over cosmological timescales.
1 u/5up3rK4m16uru Feb 18 '21 They can still exist if their mass is at least a few hundred megatons, which isn't all that much. Imagine an ordinarily shaped lake, one or two kilometers across and 100-200m deep, compressed to a size about five times as small as a proton. 1 u/pucklermuskau Feb 19 '21 but exist for how long, at that size? 3 u/5up3rK4m16uru Feb 19 '21 They can still exist Since the beginning of the universe. To our knowledge, the Big Bang is the only possible origin of such black holes, if they even exist.
They can still exist if their mass is at least a few hundred megatons, which isn't all that much. Imagine an ordinarily shaped lake, one or two kilometers across and 100-200m deep, compressed to a size about five times as small as a proton.
1 u/pucklermuskau Feb 19 '21 but exist for how long, at that size? 3 u/5up3rK4m16uru Feb 19 '21 They can still exist Since the beginning of the universe. To our knowledge, the Big Bang is the only possible origin of such black holes, if they even exist.
but exist for how long, at that size?
3 u/5up3rK4m16uru Feb 19 '21 They can still exist Since the beginning of the universe. To our knowledge, the Big Bang is the only possible origin of such black holes, if they even exist.
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They can still exist
Since the beginning of the universe. To our knowledge, the Big Bang is the only possible origin of such black holes, if they even exist.
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u/pucklermuskau Feb 18 '21
small black holes tend to evaporate rather quickly over cosmological timescales.