Define:
a) Density
b) Light Year
c) Astronomical Unit
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1
Answer:
a) Density. the relation of the weight of a substance to its size
Answered by
2
Explanation:
the mass per unit vol is called Density
unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles).
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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