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Annabelle Parker
18 February, 17:08
What is cosmic microwave background radiation?
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Jacob Lloyd
18 February, 19:53
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Cosmic, or background, radiation is the small amount of high energy radiation which is mostly left over from the big bang or from supernovas. It is mostly single protons, but also alpha particles and even sometimes heavier elements. It can also refer to the low levels of electromagnetic radiation present all over the universe.
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