NASA: National Aeronautics and Space Administration


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  1. Question

    Is here anything else in space besides our moon that does not rotate on its axis?

    Everything we know of rotates, although the speeds vary greatly. The Moon rotates on its axis once a month; if it did not, we would be able to see all sides of the Moon, not just the one hemisphere that always faces the Earth. In the solar system, Venus has the longest period of rotation, 243 days.

    David Morrison
    NAI Senior Scientist

    June 13, 2003