Donaldjohanson, a main belt asteroid, could be a relic of a cosmic collision that took place 150 million years ago.
The 700–1,300 feet-wide space rock deformed rocks more than six miles from the impact site when it hit 600 million years ago.
Around 600 million years ago, Earth was home to strange, soft-bodied sea creatures, but a powerful asteroid impact in what is ...
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