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New observations of a great big cosmic collision provide the best
evidence yet that invisible and mysterious dark matter really does
The collision, between two huge clusters of galaxies, is the "most
energetic cosmic event, besides the Big Bang, that we know about,"
said Maxim Markevitch of the Harvard-Smithsonian Center for
Astrophysics in Cambridge, Mass.
The impact split normal matter and dark matter apart, rendering
the dark matter's gravitational presence observable.
"A universe that's dominated by dark stuff seems preposterous,
so we wanted to test whether there were any basic flaws in our
thinking," said Doug Clowe of the University of Arizona at Tucson,
and leader of the study.
"These results are direct proof that dark matter exists."