Water Vapor Detected in Atmosphere of an Alien World Nearly Twice the Size of Earth

By Chelsea Gohd Scientists have detected water vapor in the atmosphere of K2-18 b, a potentially habitable alien world about twice the size of Earth. The finding, announced today (Sept. 11), follows a separate study released yesterday announcing the discovery of water vapor, and likely clouds and rain, on the planet. The far-off planet (it’s about …