Pronunciation: PAHR'-sek
But when we hit you with this definition, you're going to forgive Lucas for assuming the parsec was some sort of extra-fancy space second. Here it goes: A parsec is a unit of distance required to cause a heliocentric parallax of one arc second. Ouch.
This means a parsec is a unit of distance that makes a star seem to move 1/3600 of a degree compared with another distant star. It turns out that this equals 206,265 times the distance of Earth to the sun, or 3.26 light-years.
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