Noun
gigaparsec (plural gigaparsecs)
A distance of 10 parsecs
The Hubble constant becomes relevant when converting an observed redshift z into a distance d using the formula d ≈ ( / H) × z. citation One gigaparsec (Gpc) is one billion parsecs — one of the largest units of length commonly used. Source: Internet
One gigaparsec is about 3.26 billion light-years, or roughly one fourteenth of the distance to the horizon of the observable universe (dictated by the cosmic background radiation ). Source: Internet