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The most powerful cosmic-ray electrons and positrons ever detected slamming into Earth's atmosphere carry energies so high they can only have come from relatively close by, new research has revealed.
These are extremely rare, but their energy suggests they all emanated from the same corner of the Milky Way as the Solar System – and possibly even from the same source. "CRe are electrons, thus charged particles forming matter, whereas gamma-rays are photons, that is light," astronomer Mathieu de Naurois of the French National Center for Scientific Research told ScienceAlert.
"In synchrotron radiation, charged particles interact with the interstellar, galactic field. They acquire a spiral trajectory around the magnetic field lines, and radiate electromagnetic radiation, from radio up to X-rays. By doing so, they lose energy," de Naurois said.
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