Lightyears
A lightyear is the distance that light travels in one year. Since there are various definitions for the length of a year, there are correspondingly slightly different values for a lightyear. One lightyear corresponds to about 9.461e15 m, 5.879e12 mi, or 63239.7 AU, or 0.3066 pc.
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Millimeters
The millimetre is a unit of length in the metric system, equivalent to one thousandth of a metre (the SI base unit of length).
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