Water found on Neptune-sized world
HAT-P-11b is smallest exoplanet known to host the life-friendly molecule

WATER, WATER EVERYWHERE Roughly the size of Neptune, the planet HAT-P-11b is the smallest known planet to have water. The orange glow of the planet’s sun (upper right in illustration) might lend a magenta tinge to the planet’s atmosphere.
David A. Aguilar/CfA