this post was submitted on 13 Apr 2026
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Science Memes

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[–] cogitase@lemmy.dbzer0.com 5 points 1 week ago (1 children)

Is there a lower density limit for having a magnetosphere though? A habitable planet with 1.5x earth radius and the same mass would be much easier to get off of.

[–] CheeseNoodle@lemmy.world 6 points 1 week ago (1 children)

I guess that could work? Earth is actually the densest planet in the solar system so our baseline mass > size ratio might actually be a bit abnormal.

[–] MrFinnbean@lemmy.world 2 points 1 week ago (1 children)

I was sure you were bullshitting, but no. Its true.

Iron and nickel core + enough mass for gravity to start compress the planed and we are just little more dense than Mercury.

[–] CheeseNoodle@lemmy.world 1 points 1 week ago

Our core is also just huge, the outer core is larger than the moon and mercury.