In Spanish: de Años luz a Pársecs
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.
Parsecs
distance at which an object would have a parallax of one arc second. Equals approximately 3.26 light years or about 206,265 astronomical units.
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