 lunar orbit. Armstrong and Aldrin then moved into the Lunar Module and landed in the &lt;a href="http://en.wikipedia.org/wiki/Mare_Tranquillitatis" title="Mare Tranquillitatis"&gt;Sea of Tranquility&lt;/a&gt;. They stayed a total of about 21 and a half hours on the lunar surface. After lifting off in the upper part of the Lunar Module and rejoining Collins in the Command Module, they returned to Earth and landed in the &lt;a href="http://en.wikipedia.org/wiki/Pacific_Ocean" title="Pacific Ocean"&gt;Pacific