Convert 21 Light Years to Parsecs
How far is 21 light years? How long is 21 light years in parsecs? 21 ly to pc conversion.
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21 Light Years ≈
6.4386293 Parsecs
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Result in Plain English
21 light years is equal to about 6.44 parsecs.
In Scientific Notation
21 light years
= 2.1 x 101 light years
≈ 6.43863 x 100 parsecs
Light Years
A light year is the distance that light travels in one year. The year used by the International Astronomical Union is 365.25 days. A light year is defined as exactly 9,460,730,472,580.8 kilometers.
Parsecs
A parsec is a unit of distance used in astronomy. It is exactly 648,000 / Pi astronomical units, or approximately 30.9 trillion kilometers.