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To convert pc to light-years: multiply by 3.2616. To convert pc to AU: multiply by 206,265.
1 pc = 3.0857 × 10¹⁶ m = 3.2616 ly = 206,265 AU ≈ 30.857 trillion km.
For example, 1 Parsec (pc) = 30857 Terameter (Tm).
| Parsec (pc) | Terameter (Tm) |
|---|---|
| 0.1 | 3085.7 |
| 0.5 | 15428.5 |
| 1 | 30857 |
| 2 | 61714 |
| 5 | 154285 |
| 10 | 308570 |
| 25 | 771425 |
| 50 | 1542850 |
| 100 | 3085700 |
| 500 | 15428500 |
| 1000 | 30857000 |
The parsec is an astronomical unit of length defined as the distance at which one astronomical unit subtends an angle of one arcsecond.
1 pc = 3.0857 × 10¹⁶ m = 3.2616 ly = 206,265 AU ≈ 30.857 trillion km.
To convert pc to light-years: multiply by 3.2616. To convert pc to AU: multiply by 206,265.
Stellar catalogs, galaxy surveys, and cosmological distance calculations.
No known star is within 1 parsec of the Sun. Proxima Centauri is 1.30 pc away, making it the nearest star.
Pronouncing or interpreting 'parsec' as a unit of time (famously misused in Star Wars). It is strictly a distance unit.
The parsec is defined geometrically: if a star's parallax (apparent shift over 6 months) is 1 arcsecond, it's 1 pc away.
The terameter is a unit of length equal to 10¹² meters, or one trillion meters (one billion kilometers).
1 Tm = 10¹² m = 10⁹ km = 6.685 AU.
To convert Tm to AU: multiply by 6.685. To convert Tm to km: multiply by 10⁹.
Expressing outer solar system distances in metric form, though AU is standard.
One light-hour is approximately 1.08 Tm. The distance to Pluto's orbit is roughly 5.9 Tm.
Confusing tera (10¹²) with other large prefixes. Remember: tera comes after giga in the SI scale.
Think of the outer solar system: Saturn is about 1.4 Tm from the Sun, a good mental anchor.



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