NASA: National Aeronautics and Space Administration


Ask an Astrobiologist
"Why do we think Europa has potential for life? What is the current proposal for finding it?"
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  1. Question

    What causes earth to rotate on its axis?

    Everything from galaxies to planets to asteroids rotates, some fast, some slow. You don't need a "cause". David Morrison
    NAI Senior Scientist

    December 18, 2006