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Tycho`s supernova remnant lights up to Mach 1,000 shock wave

Astronomers have discovered that a reverse shock wave racing inward at Mach 1,000 (1,000 times the speed of sound) is heating the remnant of Tycho`s supernova and causing it to emit X-ray light.

Supernova remnants really do produce cosmic rays

Analysis of data from NASA`s Fermi Gamma-ray Space Telescope has provided the first clear-cut evidence the expanding debris of exploded stars produces some of the fastest-moving matter in the universe.