Linked Questions

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1answer
368 views

How close can a moon orbit a planet? [duplicate]

On an Earth-like planet, can I have a natural satellite in a stable orbit so low that it shares an atmosphere with the planet?
1
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3answers
755 views

Can Two Earth-like planets exist next to each other and share atmosphere? [duplicate]

Can Two Earth-like planets exist next to each other and share atmosphere? How far apart can they be to do this?
2
votes
1answer
644 views

What is the Roche limit for these two planets? [duplicate]

I want may planets to be as close as possible, but I really don't want this to happen. So, both of these planets are earth-sized, and they have a moon orbiting the two. These planets are also tidally ...
1
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2answers
383 views

Is it possible having a tidal locked satellite to be near enough to “touch it”? [duplicate]

Assume 2 planetoids (one of which could be Earth), similar to Earth (says similar radius, and a gravity force ranging from half to twice the gravity of Earth). Is it plausible they are tidally locked ...
1
vote
1answer
166 views

Can a closely orbitting moon with a much different atmosphere from ours come close enough for their atmospheres to overflow? [duplicate]

I'm planning to design a world with a moon whose orbit is VERY slow (takes more than a century to complete a full circle). Said moon's orbit would take them close enough for their atmosphere to flow ...
0
votes
1answer
79 views

Distance between passing planets for atmosphere exchange to occur [duplicate]

If a rogue planet (let's say about as big as the Earth) flew by the Earth, how close would it need to pass to planet Earth for atmosphere to be exchanged between the two planets?
3
votes
0answers
51 views

Can a river or something flow between two or more planets or celestial bodies in close proximity? [duplicate]

By some silver of possibility, conider that there are planets that are not of the same size but significantly large that it couln't be called a satellite. They are extremely close near the with same ...
53
votes
21answers
4k views

Planetary Scale Artworks

A highly advanced civilization has developed and is about to ascend to become beings of pure energy in a hyper-dimensional universe. Before leaving they restore our universe to a reasonably pristine ...
26
votes
8answers
4k views

Can an atmosphere englobe a planetary ring?

Would it be possible for the atmosphere of a planet to reach beyond its planetary ring so that earth-like biology could develop on some of the asteroids there? This question is mainly about whether ...
20
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7answers
4k views

Dumbbell planet - how would humans cross the bridge?

Note: I am aware of this question Could two planets be tidally locked to each other so close they share their atmosphere? My question is not about that. It is specifically about human travel. By a ...
5
votes
8answers
689 views

How can a small planetoid hold an atmosphere under artificial means?

Edit: Before I give up on this I wonder how could an advanced civilization create conditions on a small planetoid (Ceres sized?) to keep an Earth level breathable atmosphere? It seems like its ...
8
votes
4answers
842 views

Could Pluto/Charon support an atmosphere between them?

Somewhat inspired by this question : Could a civilization as advanced as humans exist on a planet/dwarf planet like Pluto? Assume two dwarf planets in tide lock orbit around one-another. Assume ...
7
votes
3answers
860 views

Siamese Twin Planets?

Premise I want to explore the possibility of a planet that is extremely misshapen. If we were to extrapolate what we have observed from our solar system and the extra-solar planets discovered so far, ...
9
votes
3answers
451 views

What are the climatological effects to the surface of a planet where the atmosphere gives way to vaccum? (diagram included)

(Please see diagrams) This is a question regarding an area of a Rocheworld scenario that I haven't found anything on. It is suggested that the OUT side of a planet that is tidally locked with another ...
5
votes
4answers
305 views

The long-term effects of the Moon being in contact with the Earth?

In these two questions, https://physics.stackexchange.com/questions/232141/how-much-force-would-be-required-to-destabilize-the-moons-orbit-enough-for-it-to and https://physics.stackexchange.com/...

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