“Now, tell me about GCRs.” “Those are trickier,” I said. “It stands for—” “Galactic cosmic rays,” she said. “And they’re not cosmic rays, right?” “Right. They’re just hydrogen ions—protons. But they’re going a lot faster. They’re going near the speed of light.” “Why are they called cosmic rays if they’re not even electromagnetic emissions?” “People used to think they were. The name stuck.”
