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This handout image obtained from the European Southern Observatory (ESO) shows size comparison of the planets of the TRAPPIST-1 system, lined up in order of increasing distance from their host star. The planetary surfaces are portrayed with an artist's impression of their potential surface features, including water, ice, and atmospheres. Seven planets recently spotted orbiting a dim star in our Milky Way galaxy, are rocky, have water, and are potentially "habitable", researchers studying the distant system said on February 5, 2018. Though much remains unknown about the planets' surface and atmosphere and the chances of them harbouring even rudimentary life, new measurements have not ruled out the possibility, they reported. / AFP PHOTO / European Southern Observatory / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / European Southern Observatory" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS