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  1. Masses of stars and galaxies are usually expressed in ________.

    2. A.

     Earth's mass
    B.

     Solar mass
    C.

     Lunar mass
    D.

     Neutron mass

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    Answer : Option B

    Explanation :

    Masses of stars and galaxies are usually expressed in Solar mass. The solar mass ( M ) is a standard unit of mass in astronomy, equal to approximately 2×1030 kg.

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