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A common unit astronomers use to describe distances in the universe is a light - year, which is the distance light travels during one year.

A common unit astronomers use to describe distances in the universe is a light-year, which is the distance light
travels during one year. Because light always travels at the same speed, and because its speed turns out to be
the fastest possible speed in the universe, it makes a good standard for keeping track of distances. You might
be confused because a light-year seems to imply that we are measuring time, but this mix-up of time and
distance is common in everyday life as well.

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