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IPFS News Link • Science
'Comet' Tail of Speeding Star Cluster Solves 100-Year-Old Cosmic Puzzle
• arcleinBut in 1912, Austrian-American physicist Victor Hess measured the ambient radiation level in a high-altitude balloon and discovered it was much higher than at ground level, even during an eclipse when the Sun was blocked. This meant the radiation had to be coming from space. Today we know the mysterious radiation Hess discovered as cosmic rays: atomic nuclei and elementary particles such as protons and electrons that have somehow been accelerated to nearly the speed of light.