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cosmic background radiation

n.
1.(cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about
2.725 kelvin

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    Idiom of the Day

    be off
    to leave or depart
    I plan to be off very early tomorrow morning to go to the airport.



    1.
    The first ________ of the sun in the morning made a pink glow in the sky.

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