It has been suggested that this article or section be merged into parsec. (Discuss)

A gigaparsec (one billion parsecs, 1 Gpc) is one of the largest distance measures used. One gigaparsec equals 3.261564 billion light years, which is roughly 1/4 the Hubble distance. Wikipedia does not have an article with this exact name. ... The parsec (symbol pc) is a unit of length used in astronomy. ... The parsec (symbol pc) is a unit of length used in astronomy. ... The word billion and its equivalents in other languages refer to one of two different numbers, depending on whether the writer is using the long or short scale. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... The Hubble Space Telescope (HST) is a telescope in orbit around the Earth. ...

Because a gigaparsec makes up a significant amount of the universe's size there is little or no need for larger units of length.