Scientists find possible hint of dark matter

Scientists find possible hint of dark matter
AP SCIENCE | APRIL 3, 2013
http://pulse.me/s/kbWJC

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GENEVA (AP) — It is one of the cosmos’ most mysterious unsolved cases: dark matter. It is supposedly what holds the universe together. We can’t see it, but scientists are pretty sure it’s out there.

Led by a dogged, Nobel Prize-winning gumshoe who has spent 18 years on the case, scientists put a $2 billion detector aboard the International Space Station to try to track down the stuff. And after two years, the first evidence came in Wednesday: tantalizing cosmic footprints that seem to have been left by dark matter.

But the evidence isn’t enough to declare the case closed. The footprints could have come from another, more conventional suspect: a pulsar, or a rotating, radiation-emitting star.

The Sam Spade in the investigation, physicist and Nobel laureate Sam Ting of the Massachusetts Institute of Technology, said he expects a more definitive answer in a matter of months. He confidently promised: “There is no question we’re going to solve this problem.”

“It’s a tantalizing hint,” said California Institute of Technology physicist Sean Carroll, who was not part of the team. “It’s a sign of something.” But he can’t quite say what that something is. It doesn’t eliminate the other suspect, pulsars, he added.

The results from the Alpha Magnetic Spectrometer, or AMS, are significant because dark matter is thought to make up about a quarter of all the matter in the universe.

“We live in a sea of dark matter,” said Michael Salamon, who runs the AMS program for the U.S. Energy Department. Unraveling the mystery of dark matter could help scientists better understand the composition of our universe and, more particularly, what holds galaxies together… Read more

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