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  1. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

    2. A.

     4.2 seconds
    B.

     42 seconds
    C.

     4.2 years
    D.

     42 years

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    Answer : Option C

    Explanation :

    Light from the nearest star reaches the earth in 4.2 years. The closest star to Earth are three stars in the Alpha Centauri system.

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