PrOP-M
... that the Soviet rover PrOP-M was intended to be the first rover on Mars in 1971, 26 years earlier than NASA's Sojourner?
... that the Soviet rover <b id="mwAbg"><a href="./PrOP-M" id="mwAbk" rel="mw:WikiLink" title="PrOP-M"><span about="#mwt30" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"PrOP-M"}},"i":0}}]}' id="mwAbo" typeof="mw:Transclusion">PrOP-M</span></a></b> <i id="mwAbs">(pictured)</i> was intended to be the first <a href="./Mars_rover" id="mwAbw" rel="mw:WikiLink" title="Mars rover">rover</a> on Mars in 1971, 26 years earlier than NASA's <i id="mwAb0"><a href="./Sojourner_(rover)" id="mwAb4" rel="mw:WikiLink" title="Sojourner (rover)">Sojourner</a></i><span about="#mwt29" data-mw='{"parts":[{"template":{"target":{"wt":"-?","href":"./Template:-%3F"},"params":{},"i":0}}]}' id="mwAb8" style="padding-left:0.15em;" typeof="mw:Transclusion"><span typeof="mw:Entity">?</span></span>