For Scientists, Moon Rocks Tell Story Of A Young Earth

From Philadelphia Inquirer:

For 40 years, the rocks hauled back from the moon have been changing the history of the Earth as we knew it.

The lunar rocks suggest that a smaller planet slammed into ours 4.5 billion years ago, creating the moon and enlarging the Earth. They tell the tale of a storm of space debris violently pounding both the Earth and moon, perhaps triggered by a dramatic reshuffling of the entire solar system.

Scientists today are still studying those rocks, hoping to decipher whether life had already emerged before the near-apocalyptic pummeling 3.9 billion years ago - and, incredibly, survived.

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