NASA: National Aeronautics and Space Administration


Ask an Astrobiologist
"Why do the planets orbit the Sun on a flat plane rather than different paths or levels, much the way electrons orbit the nucleus of an atom?"
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  1. Question

    Which planetarium in California allows me to view Planet X?

    A planetarium is a device for projecting star fields and astronomical photos on the inside of a dome. It does not allow you to view anything other that the material that has been programmed into the show. I don’t think you will see “Planet X” included in current planetarium shows, since it does not exist. For more than a century, astronomers have used the term “Planet X” for a hypothetical or unknown object — a possible or suspected planet. If it were real it would no longer be called Planet X but would be given a real name, as happened a few years ago with the discovery of the dwarf planet Eris.

    David Morrison
    NAI Senior Scientist

    August 7, 2009