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Show ThSndMbmi Robot gathers info about Mars on new 'Nova' While fancy suggests a helpful alien with a feather duster, the likely truth is more mundane. "The best explanation," NASA space-systeengineer Gentry Lee says, "is that a dust devil blew some of the accumulated dust off" A combination of hard work and luck has kept Opportunity BybtfO'Hara Zap2it some harrowing the Mars rover made it to its one-yelanding anniversary. On Tuesday, Jan. 4 (check local listings), PBS' science series "Nova" airs the episode "Welcome to Mars," which reviews the engineering and science success of Opportunity and its slightly more troublesome twin, Spirit. Last January, "Nova" aired "Mars Dead or Alive," which g chronicled the rovers' creation and landings. With warranties from the . overcautious engineers at Jet Propulsion Laboratories in Pasadena, Calif., the rovers sought to answer questions about' water and possible conditions for life to eBflt&t; In NovfW ar, good luck be Which has been Opportuiu d Planet since tv 8 ploringt time laat yeai. prtentiats lili" worried that dtlj&OBjhe rover's smarpanels wflufcTiventually impede its abity to produce electricity. But overnight, the rover experienced a 5 percent ''" power boost. Despite ar and Spirit alive. "Transforma- tional," Lee says of the science. "Look what they have done, my goodness sakes. They each did a ' mission near where they landed, and now they have done another mission. Spirit has done a completely new'iriission in the Columbia Hills, found all sorts of strange things, and Opportunity's done one in Endurance Crater. As the scientists were telling me yesterday, we're not done yet." Old age will one day claim the rovers, but there's no immediate end in sight. 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