• Question: Why is there no oxygen in space? (Asked Rehana)

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      Asked by 888cmte47 to Cat?, Elaine, Helena, Iain, Gabriel on 11 Mar 2016.
      • Photo: Helena Quilter

        Helena Quilter answered on 11 Mar 2016:

        Hi there Rehana! Great question.

        All the oxygen on Earth is stuck on our planet because of Earth’s gravity – that’s what stops it floating off into space!

        A long time ago there was no oxygen on Earth either – our atmosphere was full of a gas called carbon dioxide. Then millions of years ago we think some bacteria learnt how to change that carbon dioxide into oxygen. That’s what plants do too – it’s called photosynthesis! They make all the oxygen we need to breathe!

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