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A light year is a distance (length). It's the distance that

light travels through vacuum in one year.

I just thought of a kind of an analogy:

One "man-hour" is not a measurement of people (man) or of time (hour).

It's a unit of work accomplished ... the amount of a job that one man

gets done in one hour .

Similarly, the "light-year" is not a unit of brightness (light) or of time (year).

It's a unit of distance ... the distance covered at light-speed in one year.

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12y ago

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