The first Earth-like planet orbiting a distant star could be discovered within four years, astronomers believe. None of the 300 "extra-solar" planets so far identified beyond our own system is thought to be suitable for life, so the discovery of an Earth-like planet made of rock rather than hot gas or frozen ice would significantly increase the chances of finding the second habitable world, scientists said.
Friday, Apr 17th
Last update10:24:24 PM GMT
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