"Hubble telescope detects water on hot exoplanet in groundbreaking find"

The Hubble Space Telescope has detected water vapor in the atmosphere of GJ 9827d, a small, hot exoplanet with Venus-like temperatures. This marks the smallest exoplanet where an atmosphere has been detected, bringing scientists closer to characterizing Earth-like worlds. The nature of GJ 9827d remains uncertain, with possibilities ranging from a water world to a hydrogen-rich mini-Neptune. Further observations with the James Webb Space Telescope are underway to learn more about its atmospheric composition and settle the question of water worlds.