What if a day were only slightly less than an hour?

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Emu Egg
Emu Egg

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22 Oct 2019, 3:49 pm

Glad to read this informative discussions. Thanks all

quite an extreme

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22 Oct 2019, 6:14 pm

KristenBrown wrote:
Glad to read this informative discussions. Thanks all

8O Welcome on WP! :mrgreen:

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23 Oct 2019, 2:59 am

magz wrote:
All the dirt, stones and air would also escape.
The planet would lose mass and the escaped things would likely form a ring, like those around Jupiter.
The planet would shrink until the velocity on the equator (which is proportional to radius in a rotating rigid object) became lower than orbital velocity. However, that would make the planet lighter, making the orbital velocity lower, too.
I could probably calculate it for a uniform planets but you know that planets aren't uniform. The dense, metallic core would remain.
We would end up with a lot smaller planet with rings. No atmosphere and no water, gases would escape the first and light fluids would quickly follow. New moons may form from debris in the rings.

If you want a specialist to do the Math thoroughly for you, you can submit it for XKCD What If: https://what-if.xkcd.com/ . Randall seems to love this kind of questions.

Good answer.

Makes sense.

Yeah. There could be a point at which the earth would stop self destructing at that speed.

The earth might reach an equilibrium in which it keeps spinning that fast but stops loosing mass. The lighter stuff: air, water, vegetation, humans, and lighter weight soil and rocks, get ejected, but the heavier basaltic rocks deeper down in the mantle stay. And all of that ejected debris gradually coalesces into little moons or something.

Or ..not...and the earth might dismantle itself down to the core. It probably would take some sophisticated number crunching to figure out which way it would go.