Earth, Mars, Moon Have Different Origin, Study Says

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https://news.nationalgeographic.com/news/2008/03/
080319-earth-mars.html

Anne Minard
for National Geographic News
March 19, 2008

A new study is challenging the long-standing notion that the whole solar system formed from the same raw materials.

Until now most scientists had believed that the inner solar system bodies—Mercury, Venus, Earth, its moon, and Mars—had the same composition as primitive meteorites called chondrites.
From National Geo. News...

Caro and his team say scientists may now have to revisit the idea that chondrites represent the building blocks for the whole solar system.

"What our results suggest is that the sorting of the elements that make up these planets may have happened at a much earlier stage than had been believed," said Alex Halliday, a study co-author from Oxford University.

"The composition of these worlds is inconsistent with them simply forming out of large 'lumps' of stony meteorites like those we see today in the asteroid belt."

The study appears in this week's issue of the journal Nature.