How big could a hard, rocky planet be?
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How big could a hard, rocky planet be?

This is a discussion on How big could a hard, rocky planet be? within the Science and Technology forums, part of the Hobbies category; A planet like Earth is like a big rock except it's molten underneath but that molten stuff is still rock. ...

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Old 02-18-10, 10:42 AM   #1
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Default How big could a hard, rocky planet be?

A planet like Earth is like a big rock except it's molten underneath but that molten stuff is still rock. Planets like ours are extremely dense obviously because they're made of rock and not gas. Therefore they have a lot of mass and therefore a lot of gravity for their size.

So, if a rocky planet was too big the gravity would crush it because it doesn't have the nuclear fusion process to fight gravity like a star does. I just don't know how big is too big. I'm sure the size limit is much smaller than a gas giant like Jupiter.
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Old 02-20-10, 01:48 AM   #2
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Depending on what gases and what reactions you are talking about it could keep the "rocky" part there..just not very stable
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Old 02-20-10, 09:57 PM   #3
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It's probably, actually really simple physics on a really grand scale. It also probably depends on the composition of the planet. I doubt rock planets get much bigger than earth.
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