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 The sun is actually a pretty bright star.
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Feb 23, 2021 03:02
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George posted:hot young stars speaking of https://twitter.com/BadAstronomer/status/1364611587001241600
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Feb 24, 2021 17:57
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https://twitter.com/galaxy_map/status/1364937825884524545
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Feb 25, 2021 15:09
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Tulip posted:Brown dwarfs are the coolest thing in space and I love them but I can't really hype them up super well so I'll just leave it at "brown dwarfs get smaller as they gain mass" and that rules. Brown dwarves are neat because we keep confusing them with planets.
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Feb 28, 2021 02:14
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LostCosmonaut posted:Przybylski's Star is also my favorite bizarre stellar object. To expand a bit on why it's so odd, it's spectrum is completely unlike any other star known. It has a pretty elevated amount of lanthanides compared to most other stars. Haha poo poo that's crazy. Do we have a probable number for the island of stability yet?
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Mar 4, 2021 23:59
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Phanatic posted:Fact is true. It's about .3 watts per cubic meter, or 2E-4 watts per kilogram. Proton-proton fusion is insanely inefficient. Basically you've got to wait for a proton and a proton to fuse into a deuteron, and the cross-section for this reaction is essentially nonexistent; an average proton in the core of the sun could expect to stay there for billions of years before it manages to fuse with another proton. Once you've got the deuteron it'll almost immediately fuse with another proton to produce helium-3, which'll then mostly fuse with other helium-3 to produce helium-4 and some hydrogens. But that first proton:proton fusion is so incredibly difficult to achieve that it takes a star's worth of mass to get it to happen at even the pathetically low rate that it happens in a star. That's actually pretty interesting.
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Mar 10, 2021 17:14
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| # ¿ Apr 26, 2024 01:54 |
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https://twitter.com/ScienceNews/status/1386767765378322434 drat that would be a wild find.
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Apr 26, 2021 21:00
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