How many U in 1 light-year? The answer is 2.1283983065424E+17. We assume you are converting between U and light year. You can view more details on each measurement unit: U or light-year The SI base unit for length is the metre. 1 metre is equal to 22.497187851519 U, or 1.0570008340246E-16 light-year. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between U and light years. Type in your own numbers in the form to convert the units!
You can do the reverse unit conversion from light-year to U, or enter any two units below:
A light year, abbreviated ly, is the distance light travels in one year: roughly 9.46 × 1012 kilometres (9.46 petametres, or about 5.88 × 1012 (nearly six trillion) miles). More specifically, a light year is defined as the distance that a photon would travel, in free space and infinitely far away from any gravitational or magnetic fields, in one Julian year (365.25 days of 86400 seconds each).
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