Nasa’s Hubble finds water vapor in exoplanet’s GJ 9827d's atmosphere

Using Nasa's Hubble Space Telescope, astronomers have observed water vapor in the atmosphere of the tiniest exoplanet yet, GJ 9827d. The planet, which is merely about twice the diameter of Earth, serves as a potential indicator of other planets with water-rich atmospheres in our galaxy, Nasa said in a release.