what is the measure of a parsecs.
Megaparsec. by Jean Tate on December 4, 2009. A megaparsec is a million parsecs (mega-is a prefix meaning million; think of megabyte, or megapixel), and as there are about 3.3 light-years to a parsec, a megaparsec is rather a long way. The standard abbreviation is Mpc.