Light-year

A light-year (ly) is a unit of lenght, corresponding to the distance travelled by light in vacuum in one Julian year.

A light year is equal to:


 * 9,460,730,472,580.8 km (about 9.461 Pm)
 * about 5,879,000,000,000 statute miles
 * about 63,240 AU
 * about 0.3066 parsecs