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light year is the unit of?
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light year is a distance that light travels in vaccum in one Julian year. it is a unit if length used to express astronomical distances.
(Julian year -in astronomy Julian year is a unit of measurement of time defined as exactly 365.25 days of 86400 SI seconds each).
(astronomical unit is used to measure distances within the solar system).
1light year is equal to
9.461×10^15 metre.
A light-year, alternatively spelled light year (ly), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km, which is approximately 5.88 trillion mi. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year (365.25 days).