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Excitement still surrounds a possible hint of dark matter in an unexpected excess of cosmic-ray antielectrons (positrons) relative to electrons. A new set of data from the Alpha Magnetic Spectrometer (AMS) aboard the International Space Station confirms the positron excess and provides the most accurate measurement to date of the shape of both the electron and positron spectra. The analysis reveals that the positron flux is significantly different from the electron flux above 30 GeV in energy, which suggests that positrons and electrons have a different origin.

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