A parsec is a length unit used to measure the huge distances of astronomical objects outside the Solar System. A billion parsecs, or about 3.3 billion light years, are called a gigaparsec. Until we discover a multiverse, this is the largest unit of length measurement we’ll ever need. A gigaparsec makes the observable Universe seem quaint, as it stretches only about 28 gigaparsecs across, or about 14,000 cubic gigaparsecs in volume.
Keishinrei 