Skywatch

  • September 1, 2011

    Episode 350: Pluto's New Moon

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    Pluto, the most famous dwarf planet in the solar system, is known to have three moons. A new, tiny moon has been observed with the Hubble Space Telescope. The new moon is temporarily called "P4" and is a scant 8-21 miles across. These observations were made in support of the New Horizon mission, currently on its way to the Pluto system. Hubble data is helping scientists to understand what the system is like in advance of the mission's arrival.