jschild t1_jb9fsv3 wrote on March 7, 2023 at 12:49 PM Reply to comment by Modern_rocko in TIL the largest moon in our solar system, Ganymede, is larger than the planet of Mercury by Jugales Significant Oxygen only is, because oxygen is so reactive that it bonds with other elements pretty fast. Trace amounts are ok, but if you see a planet with 10-20% oxygen (and the atmosphere isn't super thin), it's almost certainly going to be life. Permalink Parent 3
jschild t1_jb9fsv3 wrote
Reply to comment by Modern_rocko in TIL the largest moon in our solar system, Ganymede, is larger than the planet of Mercury by Jugales
Significant Oxygen only is, because oxygen is so reactive that it bonds with other elements pretty fast. Trace amounts are ok, but if you see a planet with 10-20% oxygen (and the atmosphere isn't super thin), it's almost certainly going to be life.