For thousands of years, humanity viewed the skies as unchanging, except for a few "wandering stars" (that we now know are planets). As we improved our ability to perceive the cosmos with ...
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Scientists finally trace the source of the cosmic ray knee
For decades, a sharp kink in the energy spectrum of particles raining down from space has taunted astrophysicists, hinting at powerful engines in our Galaxy but refusing to reveal their identity. Now ...
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