Timeline for Exoplanets, Protoplanets, and planetesimals
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 1, 2019 at 15:00 | history | tweeted | twitter.com/StackAstronomy/status/1179048487482249216 | ||
| Sep 29, 2019 at 9:32 | answer | added | ProfRob | timeline score: 3 | |
| Sep 29, 2019 at 2:45 | comment | added | PM 2Ring | Bear in mind that most of the mass in gas giants is hydrogen & around 10% helium (by mass). Hydrogen liquifies at around 20 K, and it doesn't solidify without pressure. You can't make asteroids or planetisimals out of that stuff. True, at more reasonable temperatures you can make solid bodies from hydrogen compounds like methane, ammonia, and water, if you have enough carbon, nitrogen, or oxygen to make those compounds. | |
| Sep 29, 2019 at 1:11 | comment | added | Doug | Sorry. When I wrote 'And mostly finding gas giants', I didn't mean 'found gas giants everywhere', I meant 'most of the planets we could see are gas giants (because with our telescopes, those are the easiest to see)' | |
| Sep 29, 2019 at 0:10 | comment | added | AtmosphericPrisonEscape | "and mostly finding gas giantsand mostly finding gas giantsand mostly finding gas giants" wrong, only 0.5% of all stars host gas giants. They are a stark minority, most systems dont form them. | |
| Sep 28, 2019 at 23:20 | review | First posts | |||
| Sep 29, 2019 at 10:32 | |||||
| Sep 28, 2019 at 23:16 | history | asked | Doug | CC BY-SA 4.0 |