All Questions
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Has this random youtube crackpot trying to disprove GR inadvertedly stumbled on a genuine prediction of it? [duplicate]
I'm an Astrophysics major. I was watching strange fringe physics crackpots on Youtube to make fun of them, because I'm an acollierastro, planarwalk kinda gal. I came across this guy who thinks Black ...
8
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3
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483
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What portion of the universe is black holes?
What portion of the universe is black holes? Is it possible to estimate the percent of all mass that is in the black holes?
- 605
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If all the black holes in the Universe were combined into one supermassive black hole, what would its diameter be?
I am curious to know if anyone has ever sat down and calculated what the diameter of a black hole would be, in kilometers, if it were to contain all the mass of all the black holes that are currently ...
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5
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Is there a GR explanation for cosmological coupling causing mass increase as the universe expands?
A paper in November 2021 considered the hypothesis that things with mass, including black holes, may be coupled to cosmological expansion so that they slowly gain mass as the universe expands, similar ...
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8
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What fraction of the mass of all baryonic matter are black holes?
Is there a calculation of how much of the mass of baryonic matter is black holes, including supermassive black holes in the center of galaxies?
- 956
22
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If the observable universe were compressed into a super massive black hole, how big would it be?
I understand only a little of general relativity, but that's why I'm here! :)
Consider the hypothetical situation of some extra-terrestrial intelligence pushing all the mass in the observable ...
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