A unit of distance equal to about 3.26 light-years (30.9 trillion km). Derived from parallax of one arcsecond. Professional astronomers often prefer parsecs because the measurement relates directly to the parallax technique.
The distance light travels in one year in a vacuum: approximately 9.461 trillion km. Used to express astronomical distan...
A unit of measurement equal to the average distance between Earth and the Sun, approximately 149.6 million kilometers (9...
The apparent displacement of a nearby object against a distant background viewed from two positions. Stellar parallax me...
Dive deeper into parsec and related concepts on Cosmos Observatory.