NOVAفصل 35 جایگزینی تصویرشماره قسمت18Is There Life On Mars?OverviewNASA's twin robot explorers, Spirit and Opportunity, have endured the worst Martian storm ever recorded and survived near-fatal glitches—yet continue to operate. Now they're joined on the Red Planet by NASA's Phoenix probe, which has already made significant discoveries of its own.Air dateDecember 30, 2008Runtime (min)60
