The nearest habitable world beyond our Solar System might be right on our doorstep - astronomically speaking.
Scientists say their investigations of the closest star, Proxima Centauri, show it to have an Earth-sized planet orbiting about it.
What is more, this rocky globe is moving in a zone that would make liquid water on its surface a possibility.
Proxima is 40 trillion km away and would take a spacecraft using current technology thousands of years to reach.
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