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See... I don't understand this whole "confusing future scientists" stuff. Spores and other microbial life have been to space already without our help, and more than likely the solar wind has sent quite a bit of it in Mars's direction. While a lot of it wouldn't survive the trip, between the rigors of space and cosmic radiation... water bears for example... would have no problem on such a journey.
NASA's Viking 1 Mars Probe (in Model Form) NASA More than three decades after scientists concluded that NASA’s Viking missions to Mars had found inconclusive evidence for the existence of organic compounds on Mars, a new study says not only are there organics on Mars, but Viking found them back in the late 1970s and scientists completely missed them. The new study of the Viking program’s finding was initiated after the August 2008 discovery of perchlorates in Martian soil by the Phoenix lander.
24 May 2010 Last updated at 16:38 ET A much diminished outline is apparent in the latest images New images appear to confirm that Nasa's Phoenix lander broke apart during Mars' winter. The static spacecraft, which was sent to study the planet's "high Arctic", lost contact with Earth in late 2008. Phoenix would have been covered by carbon dioxide ice, and Nasa always said it was likely the mission would be destroyed in such harsh conditions.
November 20, 2008 Low, wide glaciers half a mile thick adorn the middle latitudes of Mars , say scientists who used radar probes to peer into debris-covered formations. The rounded slopes of material skirting steep ridges have cropped up in numerous satellite images over the years, generating controversy over whether they are mostly made of rock or ice. Using NASA's Mars Reconnaissance Orbiter, John Holt of the University of Texas at Austin and colleagues found that the landforms appear to be water ice covered by rocky rubble. The ice exists at much lower latitudes than any other known deposits on the Martian surface, and some experts say the trapped water has the potential to support humans in future missions to Mars .