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A haul of planets from Nasa's Kepler telescope includes a world sharing many characteristics with Earth.Kepler-452b orbits at a very similar distance from its star, though its radius is 60% larger.Mission scientists said they believed it was the most Earth-like planet yet.Such worlds are of interest to astronomers because they might be small and cool enough to host liquid water on their surface - and might therefore be hospitable to life.Nasa's science chief John Grunsfeld called the new world the "closest so far" to Earth.