Astronomers say they are one step closer to finding a habitable, Earth-like planet beyond our solar system with the discovery of an atmosphere on a rocky planet. By Jacinta Bowler, ABC Astronomers say they are one step closer to finding a habitable, Earth-like planet beyond our solar system with the discovery of an atmosphere on a rocky planet. They detected traces of helium in the atmosphere of LHS 1140 b, a... [4918 chars]