Closest 'habitable' planet outside our solar system discovered

The search is on for a second 'Earth' that humans could colonise and now there's a new candidate - Wolf 1061c. The rocky orb, more than four times the mass of the Earth, is the closest potentially habitable planet found outside our solar system so far, orbiting a star just 14 light years away. It is one of three detected by Australian astronomers that orbit a red dwarf star called Wolf 1061.
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