Joinastronomersinaracetofindaplanetthatcansustainlife.Amidallthespaceintheuniverse,isthereanotherworldlikeours?　　Astronomersstudyinganearbystarsaythey'vefoundthefirstpotentiallyhabitableplanet—likelyarockyplacewithanatmosphere,temperateregions,andcrucially,liquidwater,consideredvitalforlifeasweknowit.Otherextrasolarplan...