Data sent from the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Galileo_spacecraft" id="mwAYQ" rel="mw:WikiLink" title="Galileo spacecraft">Galileo spacecraft</a> indicates that <a href="https://en.wikipedia.org/wiki/Jupiter" id="mwAYU" rel="mw:WikiLink" title="Jupiter">Jupiter</a>'s moon <a href="https://en.wikipedia.org/wiki/Europa_(moon)" id="mwAYY" rel="mw:WikiLink" title="Europa (moon)">Europa</a> has a liquid ocean under a thick crust of ice.