Author Topic: Astronomy/cosmology questions...  (Read 19853 times)

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Offline Geo

Re: Astronomy/cosmology questions...
« Reply #300 on: March 05, 2019, 07:46:57 AM »
I'd say the ISS doesn't have power to spare for such a project?

Besides, isn't the ISS still within Earth's magnetic field? Its barely 500 clicks up...

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Re: Astronomy/cosmology questions...
« Reply #301 on: March 05, 2019, 07:45:01 PM »
Yes, it's inside the Van Allen belts.

Still...

Offline Elok

Re: Astronomy/cosmology questions...
« Reply #302 on: March 06, 2019, 03:26:05 AM »
So, probably question for Lori specifically: is the Seveneves scenario plausible, in the sense that if something fragged the moon, the pieces would stay in close proximity for a bit banging into each other, but gradually break into smaller and smaller pieces?  I always found that really hard to visualize.  Threw this question out to the Slate Star Codex hivemind, but didn't get a complete answer.

Offline Unorthodox

Re: Astronomy/cosmology questions...
« Reply #303 on: March 07, 2019, 12:27:45 PM »
If I understand the synopsis correctly: the moon breaks into several large chunks that stay where the moon was, I'd rate it as rather impractical but technically plausible. 

Anything that would destroy the moon would most likely severely impact it's orbit.  Given some theoretical internal break up, it's theoretically possible for larger chunks to stay together (The Armageddon movie wouldn't have worked, for instance, gravity would have held the two pieces together at least enough to strike earth) However, it's far more likely that smaller pieces would be drug into a different orbit by gravity, or even ejected from orbit by the larger chunks.

Assuming the pieces somehow stayed close, those pieces would likely interact rather violently, sending hunks in all directions when they eventually collided or tossing out their smaller counterparts.  Earth would most likely be struck by a civilization ending piece from this fairly quickly. The large pieces are at least just as likely to fuse back together during these impacts as they are playing bumper cars (I haven't studied impacts at all, so just really basic knowledge of this bit, but we have plenty of evidence of collision fusing out there, it might actually be more likely), but the debris would be massive. 

If any of the pieces drifted inside the Roche limit, it would be ground up by tidal forces, eventually forming equatorial rings and likely pelting the earth.   

Lord knows what the loss/changes of lunar gravity would do to the systems here on earth.

Offline E_T

Re: Astronomy/cosmology questions...
« Reply #304 on: March 07, 2019, 03:35:07 PM »
As well as the effects of Earth Tidal Forces on the Lunar Debris.
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