Cosmic microwave backgroundCosmic microwave background

The Cosmic Microwave Background (commonly abbreviated CMB) is the ambient radiation left over from the Big Bang. It is the oldest light in the universe. While the radiation can be observed in all directions, there are very slight variations in the temperature. These variations are an active area of study since it is believed that they may account for the distribution of stars and galaxies throughout the universe. The CMB was discovered accidentally in 1964 by astronomers Arno Penzias and Robert Wilson.

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