Science Memes

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W Earth (mander.xyz)

submitted 3 months ago by [email protected] to c/[email protected]

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[–] [email protected] 8 points 3 months ago* (last edited 3 months ago) (2 children)

Phobos is this big and still not round? Uh, what was the name, the size where stone behaves like a liquid. Well, Phobos doesn't have that yet?

[–] [email protected] 13 points 3 months ago (2 children)

Phobos is tiny. It's just very close compared to our moon. 9500km as compared to our 384000km.

[–] [email protected] 5 points 3 months ago

And the sun looks smaller from Mars because it's further away, making Phobos seem bigger

[–] [email protected] 1 points 3 months ago

Ah, thanks! Also, Phobos is fast!

[–] [email protected] 10 points 3 months ago* (last edited 3 months ago) (1 children)

I believe you are looking for hydrostatic equilibrium. There don't seem to be good answers for this online, but according to Robert Black on this Quora post:

There isn't a minimium per se but the generally accepted number for a mass to form into a sphere under its own gravity is 1/10,000th the mass of the Earth or 600 quintillion kg. As for size, it really depends on the composition of the body. The numbers are generally accepted to have a diameter of about 600km for a rocky body.

A quintillion is 1 x 10 to the 18th and Phobos has a mass of 1.0659 x 10 to the 16th kilograms and a diameter of 22 kilometers.

[–] [email protected] 1 points 3 months ago

Yes that, thanks!