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A Megaparsec is a million parsecs (mega- is a prefix meaning million) there are about 3.3 light-years to a parsec, a megaparsec is rather a long way. The standard abbreviation is Mpc. When discussing distances like the size of a galaxy cluster, or a supercluster, or a void, the megaparsec is a handy unit.[1]

Notes and References Edit

  1. http://www.universetoday.com/46843/megaparsec/
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