Interesting theory. No one knows what caused the bombardment. Nothing like it has happened since. That's what the experts say. Stay tuned.
It is literally a revolution in our ideas about how our solar system evolved. It could be that our form of life today -- every living thing that we see today -- is due to this bombardment that happened 3.9 billion years ago.
- William Bottke, Southwest Research Institute
Useful links:
www.arc.nasa.gov
www.oca.eu
www.swri.org
http://neo.jpl.nasa.gov
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