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EXO WORLDS
'Missing' element gives planet birth clues
by Staff Writers
Davis, Calif. (UPI) Feb 24, 2011


disclaimer: image is for illustration purposes only

A search for a missing metal in the Earth could help scientists understand the early stages of planet formation, U.S. researchers say.

Scientists studying the element chromium have known for years that the element's isotopes are relatively underrepresented in the Earth's mantle and crust, and the question has been whether they were volatile and disappeared into space in the planet's early period or got sucked in the Earth's deep core at some point.

University of California, Davis, geology professor Qing-Zhu Yin and others compared measurements of chromium isotopes in meteors with levels found in the Earth's crust.

The meteorites studied are from a class called chondrites, left over from the formation of the solar system more than 4.5 billion years ago, a UC Davis release said Thursday.

From the comparisons the researchers were able to determine that some forms of the element chromium separated and disappeared deep into the planet's core, and some 65 percent of the "missing" chromium is most likely in the Earth's core.

The separation must have happened early in the planet building process, the researchers say, probably in the multiple smaller bodies that assembled into the Earth or when the Earth was still molten but smaller than today.

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EXO WORLDS
Planet Formation In Action
Moffett Field CA (SPX) Feb 25, 2011
Using ESO's Very Large Telescope an international team of astronomers has been able to study the short-lived disc of material around a young star that is in the early stages of making a planetary system. For the first time a smaller companion could be detected that may be the cause of the large gap found in the disc. Future observations will determine whether this companion is a planet or a brow ... read more


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