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"Cosmic rays" are highly-accelerated particles, mostly protons, that permeate outer space.

Current theory about the oldest cosmic rays indicates they may originate from the decay of somewhat exotic sources created by the 'Big Bang' about 14 billion years ago. However, the high speed of these particles suggests that many derive from acceleration by galactic centers, which formed beginning about a billion years later, or from supernovas that occurred relatively recently in astronomical time.

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