[size=1.077em]Among eight new planets they have spied in distant solar systems, astronomers say one in particular has usurped the title of "most Earth-like alien world".
[size=1.077em]All eight were picked out by Nasa's Kepler space telescope, taking its tally of such "exoplanets" past 1,000.
[size=1.077em]But only three sit safely within the "habitable zone" of their host star - and one in particular is rocky, like Earth, as well as only slightly warmer.
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