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Jupiter and its four largest moons.
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More and more Moons of Jupiter
News story originally written on March 20, 2003

Astronomers have discovered twelve new moons of Jupiter so far in 2003. Jupiter now has a total of 52 moons that we know of. Jupiter, the largest planet in our Solar System, has more moons than any other planet. Astronomers think there may be as many as 100 small moons orbiting Jupiter! So we may discover many more moons around Jupiter in the future.

For now, the moons all have temporary names. They are called S/2003 J1 through S/2003 J12. Later the moons will be given "real" names.

All of the new moons are very small. They are between one and four kilometers in diameter. The moons were discovered using telescopes on the top of a volcano called Mauna Kea in Hawaii.


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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA