• Question: Why is there oxygen on Earth and not in other planets?

    Asked by swim43egg to Daoud, Jess, Jenny, Jason, Janis, Caitríona on 12 Nov 2019.
    • Photo: Janis Aleksans

      Janis Aleksans answered on 12 Nov 2019:

      Oxygen is made by plants through photosynthesis, and so far Earth is the only planet we know to have plants. However there are many planets that have oxygen as part of other chemical molecules in their atmosphere, such as CO2.

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