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Astronomy

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  • $\begingroup$ "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. $\endgroup$
    – AtmosphericPrisonEscape
    Commented Sep 29, 2019 at 0:10
  • $\begingroup$ 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)' $\endgroup$
    – Doug
    Commented Sep 29, 2019 at 1:11
  • $\begingroup$ 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. $\endgroup$
    – PM 2Ring
    Commented Sep 29, 2019 at 2:45