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sâmbătă, 30 iunie 2012

Milky Way collision reverberating 100 million years later

A satellite galaxy or other massive object that passed through the Milky Way 100 million years ago was such a shock to the system that its many millions of stars are still showing the effects of the collision today, a team of Canadian and U.S. physicists has found.

Astrophysicist Lawrence Widrow of Queen's University in Kingston, Ont., and his colleagues looked at data for hundreds of thousands of stars in the Milky Way and found that the way they were moving within what is known as the disk of the galaxy indicated they had been disturbed in some way.