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Scientists long tried to figure out why some spots on Earth had more radioactive air than others. It wasn鈥檛 until 1912, when Victor Hess took an electrometer skyward in a balloon, that it became clear the extra radiation was coming, not from inside the Earth, but from above it. Way above it. But where exactly did these 鈥渃osmic rays,鈥� as physicist Robert Millikan dubbed them, come from? (The rays are, more precisely, high-energy charged particles.) An international network of astronomers, including researchers from 污污草莓视频, just might have a lead on this mystery.