Convert Gigaparsecs to Parsecs
Convert Gigaparsecs (Gpc) to Parsecs (pc) instantly and accurately.
Conversion Formula
pc = Gpc × 1000000000
About Gigaparsecs
A gigaparsec (Gpc) is one billion parsecs or 3.26 billion light years, used for measuring the largest structures in the cosmos. The observable universe has a radius of about 14.3 gigaparsecs (46 billion light years when accounting for expansion). Superclusters and cosmic filaments, the largest known structures, span hundreds of megaparsecs to gigaparsecs. The cosmic microwave background radiation originates from a distance of about 14 gigaparsecs. This unit helps cosmologists map the large-scale structure of the universe and understand its evolution since the Big Bang.
About Parsecs
A parsec (pc) is approximately 3.26 light years or 30.86 trillion kilometers, defined as the distance at which one astronomical unit subtends an angle of one arcsecond. Despite being less familiar than light years, parsecs are preferred by professional astronomers because they relate directly to stellar parallax measurements - the apparent shift in a star's position as Earth orbits the Sun. Most nearby stars are within a few dozen parsecs, our galaxy is about 30,000 parsecs across, and distant galaxies are measured in millions of parsecs (megaparsecs).
Quick Reference Table
| Gigaparsecs (Gpc) | Parsecs (pc) |
|---|---|
| 1 Gpc | 1000000000 pc |
| 2 Gpc | 2 × 109 pc |
| 5 Gpc | 5 × 109 pc |
| 10 Gpc | 1 × 1010 pc |
| 25 Gpc | 2.5 × 1010 pc |
| 50 Gpc | 5 × 1010 pc |
| 100 Gpc | 1 × 1011 pc |