The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time, as a year is a unit of time equivalent to approximately 365 days.

What is the distance that light travels in one year called? Let's have some stream of consciousness first.
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To answer this question, we should know that: As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). So, the answer is a light - year.
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