Light-year is length unit, symbol: [ly]. Definition of 1 light-year ≡ Distance light travels in vacuum in 365.25 days. . Compared to metre, light-year is bigger unit.
• 1 [ly] = (exactly) `9460730472580800` [m]
• 1 [m] = (exactly) `1/(9460730472580800)` [ly] = 1.0570008340246 × 10-16 [ly]
Multiply convert of light-year to common length units:[ly]
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The International Astronomical Union and Astronomical Units. http://www.iau.org/public_pres...