Europa: Oceans of Life? ... Credit Copyright: Voyager Project , JPL , and NASA Explanation: Is there life beneath Europa's frozen surface? ... Europa , the fourth largest moon of Jupiter , was recently discovered to have a thin oxygen atmosphere by scientists using the Hubble Space Telescope . ... Late News: NASA to Release New Europa and Jupiter Pictures Thursday . More Late News: New Evidence Suggests Microscopic Life Existed on Mars . ... NASA Web Site Statements, Warnings, and Disclaimers . ...