Do all planets have oxygen?

Answer 1

Well, probably somewhere in the planet, yes. But if you mean, do they all
have breathable atmospheres, no. Only Earth has breathable oxygen.

Answer 2

There's already some very good answers but you asked a very good question. Because oxygen is such an excellent oxidizing (sic) agent, it would seem unlikely that you could find significant amounts of molecular oxygen in the atmosphere of any planet without some mechanism, e.g. life, to replenish it.

Any free oxygen molecules present in a planet's atmosphere would quickly bind with with other elements early in the planet's history. Hence if large amounts of O2 are ever detected in the atmosphere of any newly discovered planet it might serve as a telltale clue to the presence of life on that world because some ongoing process would be needed to generate the O2.

Answer 3

Oxygen is a very common element and can be found just about anywhere you look. But oxygen is a very reactive element, and most of it gets bound up in various oxides. Free atmospheric oxygen, as found on Earth is rare, because over time it tends to react and be taken out of the atmosphere. If it weren't for green plants, Earth would have much less oxygen in its atmosphere.

Answer 4

Well : according to our own " Galaxy it's Planet Earth & yes
that has Oxygen only ! "