Saturn's ocean-bearing moon Enceladus taken in visible light with the Cassini spacecraft narrow-angle camera on Nov. 27, 2016. NASA/JPL-Caltech/Space Science Institute/Handout via REUTERS  ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. - RTX35GEK

Alien life may already exist in our galaxy

Saturn’s moon Enceladus, Jupiter’s moon Europa, Pluto and its moon Charon, as well as the dwarf planet Ceres are potential homes for extra-terrestrials, scientists at University of...