bearsnchairs t1_jba05j3 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
Molecular oxygen, O2 is seen as a marker for biological activity. Molecule oxygen is pretty reactive and over long time scales it will react with mostly anything and form oxides. If it builds up enough for you to detect it, there must be a source to counteract the sink.
Fun fact, oxygen is the most abundant element in earth’s crust.
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