Hubble and Spitzer Space Telescope data on a pair of exoplanets, Kepler-138 c and Kepler-138 d suggests that they may be water worlds. The planets orbit a star about 218 light-years away. [Full Story](https://www.space.com/exoplanets-potential-water-worlds-discovered) Credit: NASA's Goddard Space Flight Center Paul Morris: Lead Producer Cassandra Morris: Narrator Image Credit: Water World next to Earth Benoit Gougeon, Université de Montréal Music & Sound “Space Museum” by Harry Gregson Williams [BMI] and Ho Ling Tang [BMI] via Atmosphere Music Ltd. [PRS] and Universal Production Music