NASA's Hubble Telescope Discovers Water Vapor on Small Exoplanet

NASA's Hubble Space Telescope has detected water vapour in the atmosphere of the exoplanet GJ 9827d, which is approximately twice the size of Earth and as hot as Venus. This discovery could indicate the presence of water-rich atmospheres on other planets in our galaxy. The planet, located 97 light years from Earth, completes an orbit around a red dwarf star every 6.2 days. Scientists are considering whether the planet could be a mini-Neptune with a hydrogen-rich envelope or a warmer version of Jupiter's moon Europa. NASA's focus now turns to understanding the total inventory of elements on the planet to compare with its host star and comprehend its formation.