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Jonny was here sky determine tetracycline 500mg online consume wander According to scientists, cosmic rays can damage electronics on Earth. They can also harm human DNA, which puts astronauts in space especially at risk. Exploding stars called supernovae are among the sources of cosmic rays in the Milky Way, while distant objects such as collapsing huge stars and active galactic nuclei far from the Milky Way also produce the highest-energy particles.