What is a parsec?  definition and calculation

What is a parsec? definition and calculation

A parsec is a unit of distance, often used by astronomers as an alternative to the light year, just as kilometers can be used as an alternative to miles. Sci-fi franchises such as Star Wars have been known to misuse the word “parsec” and incorrectly describe it as a measure of time or speed.

In fact, a parsec is approximately 3.26 light-years, or almost 19 trillion miles (31 trillion km), according to the California Institute of Technology. (opens in new tab) (Kaltech).

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