Jupiter's New Moon

Tue, 01 Oct 2002 03:02:45 +0000

Does Jupiter, the largest planet in the solar system, have a 17th moon? Astronomers seem to think it does.

Last year, astronomers at the University of Arizona and a Massachusets Observatory discovered what looked like a new moon around Jupiter. They had been scanning the skies for comets and asteroids as part of a spacewatch programme. In fact, when they saw the new moon, they thought it might be a comet or an asteroid.

A comet is a small body of ice and dust that orbits the Sun. When it approaches the Sun, the ice in it vaporises and forms a head and a tail. This object around Jupiter looked nothing like one, though it moved in an elongated orbit like a comet. It looked even less like an asteroid, which is a small rocky body that orbits the Sun. In the solar system, asteroids exist in a wide belt between Mars and Jupiter.

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Jupiter's New Moon