Earth 2.0: have we found Earth’s twin planet?

Since its launch in 2009, Nasa’s Kepler space telescope has discovered thousands of fascinating and bizarre worlds. These range from a real life Tatooine to enormous gas giants that reach sizes scientists once thought were impossible. However, the recent discovery of Kepler-452b, a world 1400 light years away, is perhaps its most significant finding yet. Excitingly, this is because the mission’s scientists have declared they believe the planet to be the most Earth-like planet ever discovered.
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