A new planet has been discovered orbiting a distant star - the smallest yet detected outside our own Solar System.The mini-world, the size of the Moon, is described as hot and barren and thought to be like a small version of Mercury.
The planet's close orbit to its star - Kepler-37 - means it would be too hostile to support life but scientists say its discovery is significant as it shows that it should be possible to spot Earth-type planets, if there are any out there.
They have called the new world Kepler-37b, after the star.
http://news.sky.com/story/1054740/new-planet-smallest-yet-outside-solar-system
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