NASA: National Aeronautics and Space Administration


Ask an Astrobiologist
"I took pictures several times of UFOs and small crafts not from our planet. If it is of your interest, how can I send you some photos? "
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  1. Question

    Is there any planet without a night? How many moons it has?

    "Night" simply refers to the side of a planet that faces away from the Sun. Any planet will have one side that is illuminated by the Sun and one side that is in night, and as the planet rotates day and night alternate as they do on Earth. David Morrison
    NAI Senior Scientist

    March 28, 2007