Could we see into the past?

If we put a giant mirror in space, could see Earth a million years ago?
20 February 2017
Presented by Graihagh Jackson
Production by Graihagh Jackson.

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A glass ball

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Listener David got in touch to ask about whether mirrors in space could show us what Earth was like a million years ago. Graihagh Jackson asked Cambridge University's Anna Hourihane to explain how this might work...

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