The Hubble Space Telescope has identified a celestial gem in the vastness of our galaxy, the smallest exoplanet with detectable water vapour in its atmosphere. GJ 9827d was discovered in a distant world approximately twice the diameter of our own Earth. br br #NASA #AlienPlanet #GJ9827d #HubbleSpaceTelescope #SolarSystem #SpaceNewsbr ~HT.99~PR.151~ED.