Question

define light year parsec and astronomical unit
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Answer 1

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Here is your answer

Light year : A light year is the distance travelled by light in vaccum, in one year.

Parsec: One parsec is the distance from where the semi major axis of orbit of earth(1 A.U.)subtends an angle of one second.

Astronomical unit:- One astronomical unit is equal to the mean distance between the earth and the sun.

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