Fermi gamma-ray space telescope confirms puzzling preponderance of positrons

(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.

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Fermi gamma-ray space telescope confirms puzzling preponderance of positrons