The Blueberries of Mars

U.S. GEOLOGICAL SURVEY / JSP / NASA
PAY DIRT: The blueberries are actually the size of BB pellets and are probably minerals that accreted in water

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The next step the search for life will have to wait until 2013 or so. That's when NASA has tentatively scheduled the first round trip to Mars a mission that will pluck selected rocks off the Red Planet and bring them back home for closer study. Whether humans will ever follow those machines President Bush's January announcement notwithstanding is impossible to say.