Fermi gamma-ray space telescope confirms puzzling preponderance of positrons
Tuesday, September 13, 2011 - 04:30
in Astronomy & Space
(PhysOrg.com) -- By finding a clever way to use the Earth itself as a scientific instrument, members of a SLAC-led research team turned the Fermi Gamma-ray Space Telescope into a positron detector and confirmed a startling discovery from 2009 that found an excess of these antimatter particles in cosmic rays, a possible sign of dark matter.