NASA’s 2001 Mars Odyssey spacecraft, set for launch on April 7, aims to find out what Earth’s planetary neighbor is made of and evaluate radiation that could be risky to humans, space agency officials said on Monday. Admittedly snake-bit by earlier failed missions, the National Aeronautics and Space Administration has spent about $12 million on additional reviews to cut down on the possibility of failure. The total cost of the unmanned orbital mission is $297 million.