Timeline for What Is The Minimum Size Of A Planet To Harbor Human Life?
Current License: CC BY-SA 3.0
15 events
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| Apr 13, 2017 at 12:52 | history | edited | CommunityBot |
replaced http://worldbuilding.stackexchange.com/ with https://worldbuilding.stackexchange.com/
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| Jul 24, 2016 at 9:07 | comment | added | Stephanie | Also for the miniumum escape velocities for a planet to hold a N2, CO2 and H20 atmosphere, is that over billions of years or only a few million? 3.5 km/s seems too low to be over a billion years or up to Earth's current age. Such a planet would be less than Mars's size and have no magnetic field, though if it orbited a gas giant maybe it could JUST hang onto it? | |
| Jul 24, 2016 at 8:40 | comment | added | Stephanie | That gas retention chart is interesting particularly when it comes to the Galilean moons, Io could theoretically hold an atmosphere rich in CO2 for billions of years yet only has a trace atmosphere, Ganymede being just above the Oxygen/Nitrogen plot should be able to hold an atmosphere of those gasses, Mars is higher up there on the chart but the solar wind blew away the Martian atmosphere over billions of years. | |
| Apr 25, 2016 at 23:36 | comment | added | HDE 226868♦ | @SerbanTanasa Oh, I was using $D_V$, for example, to indicate the result of my calculation for the radius of a hypothetical planet at the orbital distance of Venus, not the orbital distance itself. I edited to make the labels clearer, and also updated my calculations, which seem a bit screwy, although I can't find an error. | |
| Apr 25, 2016 at 23:34 | history | edited | HDE 226868♦ | CC BY-SA 3.0 |
Clarified what some notation meant; corrected calculations.
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| Apr 25, 2016 at 13:52 | comment | added | user3652621 | @HDE226868 something's hinky here. D is the orbital distance. how can that be in Km? | |
| Jan 5, 2016 at 4:23 | vote | accept | Xandar The Zenon | ||
| Jan 5, 2016 at 3:05 | comment | added | HDE 226868♦ | @XandarTheZenon Summary added. | |
| Jan 5, 2016 at 3:05 | history | edited | HDE 226868♦ | CC BY-SA 3.0 |
Added summary.
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| Jan 5, 2016 at 2:39 | comment | added | Xandar The Zenon | I see, this makes sense. | |
| Jan 5, 2016 at 2:33 | comment | added | HDE 226868♦ | @XandarTheZenon It "pings" them, sending a message to their inbox. People are always automatically "pinged" by comments on their own post, but not on other people's posts. | |
| Jan 5, 2016 at 2:26 | comment | added | Xandar The Zenon | Thanks HDE, also, I know this is a little off topic, but why do people do the @insertname when addressing people? | |
| Jan 5, 2016 at 2:18 | comment | added | HDE 226868♦ | @XandarTheZenon Sure. Being concise is not my strong suit. I'm busy at the moment, but I'll condense it later. | |
| Jan 5, 2016 at 2:15 | comment | added | Xandar The Zenon | Um, I'm reasonably sure that is a great answer, but could you write a summary? I kind of just read science science math math math science, three numbers equal to scientific variables. Some of us aren't quite as smart as others. | |
| Jan 5, 2016 at 1:53 | history | answered | HDE 226868♦ | CC BY-SA 3.0 |