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1. en.wikipedia.org › wiki › Cosmic_microwave_backgroundCosmic microwave background - Wikipedia

   en.wikipedia.org › wiki › Cosmic_microwave_background

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   7 hours ago · t. e. The cosmic microwave background ( CMB or CMBR) is microwave radiation that fills all space in the observable universe. It is a remnant that provides an important source of data on the primordial universe. [1] With a standard optical telescope, the background space between stars and galaxies is almost completely dark.

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