Timeline for How would an earth-like planet with a habitable moon work and how to get there?
Current License: CC BY-SA 3.0
17 events
| when toggle format | what | by | license | comment | |
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| Apr 13, 2017 at 12:52 | history | edited | CommunityBot |
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| Apr 6, 2017 at 8:32 | answer | added | Hannah | timeline score: 0 | |
| Apr 5, 2017 at 20:10 | answer | added | M. A. Golding | timeline score: 1 | |
| Aug 12, 2016 at 0:57 | comment | added | Inquisitive | I think you're out of luck given your problem statement. The mass of our moon is 1.2% of Earth's mass. That's tiny. And if you look at Mars, its gravity is low to the point where it didn't hold on to an atmosphere very long. Mars only has 11% of Earth's mass. A planet the mass of Venus or larger seems to hold an atmosphere for the timescale that interests you. | |
| May 6, 2015 at 0:16 | answer | added | JDługosz | timeline score: 3 | |
| May 4, 2015 at 18:30 | answer | added | Samuel | timeline score: 7 | |
| May 4, 2015 at 17:48 | comment | added | Jax | @2012rcampion Higher surface gravity is fine. I might ask a question some time in the future on how life (specifically sapient life) would evolve on such a planet. I would go up to 4 or 5 times the surface gravity of the Earth. | |
| May 4, 2015 at 17:39 | answer | added | Jim2B | timeline score: 5 | |
| May 4, 2015 at 17:26 | comment | added | jamesqf | Why does the size of your planet have to change? What matters is the size/gravity of your moon, if you want it to have an atmosphere. So the simplest case is two Earth-sized bodies orbiting a common center of gravity, and the only effects (assuming same distance) are higher tides and brighter moonlight. | |
| May 4, 2015 at 17:19 | comment | added | J.D. Ray | I supsect people are asking is that diameter (or radius, really) of the planet feeds directly into your question of what's required to escape the gravity well. Mass goes into determining gravitational pull, radius goes into determining how much the planet assists with achieving escape velocity (this is why we put launch facilities as close to the equator as possible). Your description of the habitability of the moon is superfluous, other than as a general description of why people are trying to achieve escape velocity, though it will educate about ship type. The fact is they are. | |
| May 4, 2015 at 17:16 | comment | added | 2012rcampion | Not all of us follow the sandbox closely. So you want the moon to have enough gravity to hold onto a significant atmosphere. Do you want the planet to have Earth-like surface gravity, or would higher gravity due to the increased mass be ok? (And if so, how high are you willing to go?) | |
| May 4, 2015 at 17:05 | comment | added | Jax | @Samuel Volume. I had this question in the sandbox for a few weeks. I would have thought it would have been addressed in the comments section. | |
| May 4, 2015 at 16:28 | comment | added | Samuel | @DJMethaneMan When you say "size" do you mean volume, radius, or mass? Also, how fast does the planet spin? | |
| May 4, 2015 at 16:19 | comment | added | Frostfyre | So you want your world to be 3.5 x Earth's mass with an equal density, which (inherently) requires a volume of 3.5 x Earth's. My point was that you seemed to be combining/mixing definitions. | |
| May 4, 2015 at 16:16 | comment | added | Jax | @Frostfyre I want a planet at least 3.5 times the mass (and also size) of the Earth with a seperate moon that is also habitable. | |
| May 4, 2015 at 16:13 | comment | added | Frostfyre | I think you might be conflating mass and volume. Something can be several times the mass of the Earth and still be the size of the Moon. | |
| May 4, 2015 at 16:10 | history | asked | Jax | CC BY-SA 3.0 |