CSExtra – Top Space News for Wednesday, April 23, 2014Today's CSExtra offers the latest reporting and commentary on space related activities from across the globe. NASA Administrator Charles Bolden opens Human to Mars Summit in Washington with defense of plans for human exploration of asteroids as step towards red planet. Critics question costs, say NASA should limit its missions to finding life's origins, understanding its future. Students contribute to design of radiation shielding on Orion crew capsule. NASA considers changes to radiation exposure policies. Destructive asteroids striking Earth more frequently than previous assumptions, according to planetary defenders.
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