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SMART-1, first lunar probe of the European Space Agency. SMART-1 was launched on Sept. 27, 2003. The 367-kg (809-pound) probe had a xenon-ion engine that generated only 7 grams (0.2 ounce) of thrust, but it was sufficient to nudge SMART-1 from its first stop (the first Lagrangian point between Earth and the Sun) into lunar orbit on Nov. 15, 2003. Once there, SMART-1 scanned the Moon for signs of water in polar craters and mapped...