An artist's depiction shows the possible surface of TRAPPIST-1f, on one of seven newly discovered planets in the TRAPPIST-1 system that scientists using the Spitzer Space Telescope and ground based telescopes have discovered according to NASA, in this illustration released February 22, 2017.  Courtesy NASA/JPL-Caltech/Handout via REUTERS   ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. - RTSZUS7

9 stunning exoplanet pictures

Astronomers have found a nearby solar system with seven Earth-sized planets, three of which circle their parent star at the right distance for liquid surface water, bolstering the ...