Light-Years, Parsecs & AU Converter
Formula
1 ly = 9.461 x 10^12 km = 63,241 AU = 0.3066 pc | 1 pc = 3.262 ly = 206,265 AU | 1 AU = 1.496 x 10^8 km
Frequently Asked Questions
How far is one light-year in kilometers?
One light-year is approximately 9.461 trillion kilometers (9.461 x 10^12 km). It is the distance that light travels in one year in a vacuum, at approximately 299,792 km/s.
What is a parsec?
A parsec (parallax-arcsecond) is approximately 3.262 light-years or 3.086 x 10^13 km. It is defined as the distance at which one astronomical unit subtends an angle of one arcsecond. Astronomers commonly use parsecs for interstellar distances.
How far is one AU?
One Astronomical Unit (AU) is approximately 149.6 million km (1.496 x 10^8 km), roughly the average distance from the Earth to the Sun. Light takes about 8.3 minutes to travel one AU.
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