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For questions about any large astronomical bodies classified as planets, and their effects on their systems.

5 votes

Planet Tidally-Locked to its star having eclipse day/night cycles?

The problem with a tidally locked planet is it can't have a big moon orbiting it, and as the previous answers mention it, it would cast a tiny shadow. But think of this : on your twilight zone, you h …
Keelhaul's user avatar
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5 votes

Reliability of Planetary Quarantine

Nothing is 100% impenetrable, and there's always a weakness. And the greatest weakness of all are... Humans. No matter how safe everything is, if someone has the credentials to move stuff from/to th …
Keelhaul's user avatar
  • 5,270
2 votes
Accepted

Could a habitable tidally locked planet have a day and night cycle caused by the eccentricit...

I don't know if such an eccentricity is possible given a tidally locked planet. Why ? Because it would mean an irregular planetary rotation. A tidally locked planet is still rotating, the thing is, it …
Keelhaul's user avatar
  • 5,270
19 votes

A planet with all of its water underground

Such a body is probably already existing... in our solar system ! I'll suggest that you take a look at Europa. It is estimated that Europa has an outer layer of water around 100 km (62 mi) thick; …
Keelhaul's user avatar
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3 votes

Why would someone want to teleport the Moon away from our Solar system?

The aliens saw that the humans were about to spread to the stars, and ultimatly, in the far future, would have triggered and win a war against their race. They couldn't let it happen, but at the same …
Keelhaul's user avatar
  • 5,270