define light year? 11th physics
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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 may be misinterpreted as a unit of time.
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Answer:
A light year is the distance traveled by light in 365.25 days.
As defined by the IAU, light year is a product of
Julian year and speed of light c.
It has been used since 1984.
The distance represented in light years includes those between stars in the same general area.
In nanoseconds, the light travels one foot.
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