Stephen Hawking is working on spacecraft that could travel to ‘Second Earth’ in 20 years

The renowned physicist Stephen Hawking is working on a spacecraft that can travel at a fifth of the speed of light — meaning it could reach the nearest star and send back images of a suspected ‘Second Earth’ within 25 years — in a bid to save humanity. In a speech at the Starmus Festival, Professor Hawking warned humans must soon colonise another planet if we are to survive.

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