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#1 Mar 9, 2014
. As solar system orbits centre of galaxy, it moves around in 70m year cycle
. Means it would move through a dark matter disc every 35 million years
. This corresponds to increase in pattern of comet impacts on Earth
. Researchers conclude this could have led to impact that has been linked to the extinction of the dinosaurs 66 million years ago
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#2 Mar 9, 2014
What about 35 million years ago? What happened then?
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