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It's called the Cosmic Microwave Background, or CMB for short.
Originally posted by Dr Expired
So perhaps the slowest thing in the universe is the universe itself?
By measuring the amount of the dipole anisotropy (the bluest part of the sky is .0033 K hotter than average), we can determine the magnitude of the earth's motion with respect to the CMB: the earth is moving at a speed of 370 km/s in the direction of the constellation Virgo.