All Questions
7 questions
2
votes
1
answer
270
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How Small Can a Planet be with 1G Gravity and Tectonics?
Without resorting to solid osmium inner cores that we couldn't give an origin story for, what's a cosmologically plausible lower bound of a planet's radius that also maintains 1G gravity and the sort ...
8
votes
5
answers
516
views
Can early astronomers determine the gravity of their planet's "moon" without ever going there?
As I was thinking about space flight for my world, I thought about how they would need to know a planet's gravitational force before they could land, and found that humans figured out the moon's ...
- 1,354
7
votes
3
answers
300
views
Are there any plausible 'alternative' methods of planetary formation?
The selected answer on this question provides an extremely good, and detailed, description of what is generally accepted to be the main (only?) way a terrestrial planet can form, i.e. through ...
- 4,153
5
votes
8
answers
891
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 ...
- 4,948
7
votes
1
answer
1k
views
How Would It Feel To Walk On A Rocheworld?
A while back I saw this video talking about the habitability of double planets and Rocheworlds. I haven't seen any questions about the latter case here, so I decided to take a swing at it.
For some ...
- 2,952
3
votes
1
answer
176
views
Moon rotation & orbit periods differs - can it be made feasible?
I have a mars-sized "planet" orbiting a superearth-sized mother-planet. There is also another satellite with an abnormal elliptic orbit, but it is of minor concern for now.
This is the resume of ...
- 141
20
votes
8
answers
11k
views
How could a smaller planet than Earth have a higher gravity?
I want to build a planet (or satellite) that:
is smaller than Earth,
has a thicker atmosphere than Earth but breathable,
has neither intense volcanism, nor any extreme condition of that sort that ...
- 688