Analysis of 41 billion cosmic rays striking the Alpha Magnetic Spectrometer particle detector aboard the International Space Station shows an unknown phenomena that is "consistent with a dark matter particle" known as a neutralino, researchers announced Thursday.
Key to the hunt is the ratio of positrons to electrons and so far the evidence from AMS points in the direction of dark matter.
Positrons are the anti-matter counterparts to electrons.
The smoking gun scientists look for is a rise in the ratio of positrons to electrons, followed by a dramatic fall -- the telltale sign of dark matter annihilating the Milky Way's halo, which lies beyond its central disk of stars and dust, according to Michael Turner, director of the Kavli Institute for Cosmological Physics at the University of Chicago.
NEWS: Dark Matter Mystery Deepens
If current theoretical models are correct, a massive pool of dark matter -- perhaps as big as 1 million light-years across -- envelops the visible galaxy, which is about 100,000 light-years in diameter.