Icy Jupiter Moon Throws a Curve Ball at Formation Theories

Scientists studying data from NASA's Galileo spacecraft have found that Jupiter's moon Amalthea is a pile of icy rubble less dense than water. Scientists expected moons closer to the planet to be rocky and not icy. The finding shakes up long-held theories of how moons form around giant planets.

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<p><a href="http://www.physorg.com/news4349.html">Icy Jupiter Moon Throws a Curve Ball at Formation Theories</a></p> <p> Scientists studying data from NASA's Galileo spacecraft have found that Jupiter's moon Amalthea is a pile of icy rubble less dense than water. Scientists expected moons closer to the planet to be rocky and not icy. The finding shakes up long-held theories of how moons form around giant planets. </p>