Could we create a breathable atmosphere on Mars? © Getty Images

Could we create a breathable atmosphere on Mars?

Don't hold your breath...

Asked by: Harvey Wood, by email

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Various ideas have been proposed, many involving the release of chemicals into Mars’s atmosphere to trap the Sun’s heat, triggering a greenhouse effect. This might then make Mars suitable for bacteria or plants capable of turning carbon dioxide into oxygen.

So, it may be possible – but don’t hold your breath.

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