A balloon-borne detector flying over Antarctica called the Advanced Thin Ionization Calorimeter (ATIC) has detected 70 more high-energy electrons than the normal background level attributed to supernova blasts.

Louisiana State University scientists say they could be from a nearby astrophysical object, such as a pulsar (match not yet found) or the electrons were produced when two dark matter particles met and destroyed each other (that hypothesis is strengthened by the electrons’ observed energies, peaking at 650 GeV, the signature of a WIMP (weakly interacting massive particle) dark matter particle.