One light year is equal to which of these?
Correct answer D. 9.5 × 10¹⁵ m
Explanation
A light year is the distance light travels in one year: 3 × 10⁸ m s⁻¹ × about 3.16 × 10⁷ s ≈ 9.5 × 10¹⁵ m.
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