<a href="https://en.wikipedia.org/wiki/Mariner_program" id="mwAUA" rel="mw:WikiLink" title="Mariner program">Mariner program</a>: <i id="mwAUE"><a href="https://en.wikipedia.org/wiki/Mariner_9" id="mwAUI" rel="mw:WikiLink" title="Mariner 9">Mariner 9</a></i> is launched to map 70% of the surface, and to study temporal changes in the atmosphere and surface, of <a href="https://en.wikipedia.org/wiki/Mars" id="mwAUM" rel="mw:WikiLink" title="Mars">Mars</a>.