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  1. What is the cosmic microwave background? | Space

    • An image of the cosmic microwave background radiation, taken by the European Space Agency (ESA)'s Planck satellite in 2013, shows the small variations across the sky.… See more

    How Did The Cosmic Microwave Background form?

    The universe began 13.8 billion years ago, and the CMB dates back to about 400,000 years after the Big Bang. That's because in the early stages of the universe when it was just one-hu… See more

    Space.com
    Who Discovered The Cosmic Microwave background?

    American cosmologist Ralph Apher first predicted the CMB in 1948, when he was doing … See more

    Space.com
    What Does The Cosmic Microwave Background Tell Us?

    The CMB is useful to scientists because it helps us learn how the early universe was formed. It is at a uniform temperature with only small fluctuations visible with precise telescopes… See more

    Space.com
    Additional Reading

    If you would like to learn more about the cosmic microwave background and the Big Bang, check out this free course with the Open University. You can explore the strange "co… See more

    Space.com
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