Meteorite from Mare Imbrium

ToSeek · #1 (**permalink**) 30-July-2004, 07:33 PM

Meteorite from Oman records its lunar origins, history

Quote:

Scientists have pinpointed the source of a meteorite from the moon for the first time. Their unique meteorite records four separate lunar impacts.

They are the first to precisely date Mare Imbrium, the youngest of the large meteorite craters on the moon. That date, 3.9 billion years ago, is a new key date for lunar and even terrestrial stratigraphy, the scientists say, because life on Earth would have evolved only after heavy meteorite bombardment ended.

Brady Yoon · #2 (**permalink**) 30-July-2004, 08:03 PM

This means that life formed in less than 500 million years ago! Thanks Toseek.

ToSeek · #3 (**permalink**) 30-July-2004, 08:17 PM

Quote:

Originally Posted by Brady Yoon

This means that life formed in less than 500 million years ago! Thanks Toseek.

I don't think that's what they're saying. My understanding is that life had to get started less than 3.9 billion years ago because before then Earth was getting pounded by too many rocks. Five hundred million years ago we'd already had the Cambrian explosion and were well on our way to complex animals with backbones and such.

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