this post was submitted on 28 May 2024
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Science Memes

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Falling (mander.xyz)
submitted 6 months ago by [email protected] to c/[email protected]
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[–] [email protected] 61 points 6 months ago (2 children)

It's not density, it's mass. A mass of 1kg compressed to the density of the Sun's core would pull the Earth with just as much force as a 1kg ball of styrofoam.

[–] [email protected] 21 points 6 months ago (1 children)

And is the Sun was replaced with a black hole of the same mass, the Earth would just keep on rotating around it without issues, if slightly frozen

[–] [email protected] 6 points 6 months ago (2 children)

Xkcd did a what if on a black hole moon (getting it to collapse into one may be impossible, but a black hole the mass of the moon is theoretically stable), and it has the same conclusion, except just slightly colder instead of slightly frozen. And by slightly, I mean almost imperceptible.

https://what-if.xkcd.com/129/

[–] [email protected] 8 points 6 months ago

I mean, the Sun also contributes slightly more heat to the Earth compared to the Moon. And by slightly, I mean the difference between cold and frozen

[–] [email protected] 3 points 6 months ago* (last edited 6 months ago)

Just to add some formality to this, the original commenter might want to look up the shell theorem for classical mechanics and Birkhoff's theorem for general relativity.