tl;dr: Researchers have detected helium in the atmosphere of LHS 1140 b, a rocky exoplanet 48 light-years away orbiting in its red dwarf star's habitable zone—the first atmosphere confirmed on an Earth-like world in a Goldilocks zone. Helium alone can't support life, but other gases may exist lower in the atmosphere. The finding, published in Science, is a step toward answering whether Earth-like conditions exist elsewhere, though no biosignatures have been detected.