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Question 5 (Multiple Choice Worth 3 points)

What is a light year?

A. A measure of time in space
B. The distance light travels in a year
C. The distance to Alpha Centauri
D. A term used only in science fiction


Sagot :

Final answer:

A light-year is the distance light travels in a vacuum in one year, used to measure large distances in the universe.


Explanation:

A light-year is the distance that light travels in a vacuum in one year. In scientific notation, a light-year is approximately
9.5 × 10¹5 meters. It is used to measure vast distances in the universe, such as to other stars in our Galaxy or galaxies beyond our own like the Andromeda galaxy.


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