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The Conversation

When The World Is Not Enough: How To Find Another Planet To Live On

The seafaring explorers of the 16th century famously found many new homes for humanity in faraway, unknown corners of the world. While it may seem that such colonisation has since ground to a halt, some have argued it is only a matter of time before humans start moving to "exoplanets" in foreign star systems. But how close are we to such an expansion?
12/09/2017 11:29 BST