a)Define light year ?
b) Define astronomical unit?
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a) Define light year?
A unit of astronomical distance equivalent to the distance that light travels in one year.
b) Define astronomical unit?
A unit of measurement equal to 149.6 million kilometres, the mean distance from the centre of the earth to the centre of the sun.
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Answer:
a) light year is a unit of a distance . it is the distance that light can travel in 1 year
b) astronomical unit can be defined as mean distance between earth and sun
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