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  1. The period of one revolution of sun around the centre of galaxy is called ________

    2. A.

     Parsec
    B.

     Astronomical year
    C.

     Cosmic year
    D.

     Light year

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    Answer : Option C

    Explanation :

    The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy. Estimates of the length of one orbit range from 225 to 250 million terrestrial years.

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