Short summary: They found an exoplanet (that's a planet orbiting around a different star) that has regular rock precipitation. The day side of the planet is hot enough to vaporize minerals into the atmosphere, and the night side is cool enough to re-form them as mineral rain. Sweet.
http://www.examiner.com/examiner/x-1242-Science-News-Examiner~y2009m10d1-A-planet-that-rocks
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