Water vapor, and likely clouds that rain liquid water, have been discovered on an exoplanet that lies in the habitable zone of its star. But there's an issue.
https://www.space.com/exoplanet-k2-18b-water-vapor-discovery-drama.html
Water vapor, and likely clouds that rain liquid water, have been discovered on an exoplanet that lies in the habitable zone of its star. But there's an issue.
https://www.space.com/exoplanet-k2-18b-water-vapor-discovery-drama.html