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A light-year (abbreviation: ly), sometimes referred to incorrectly as a light year, is a unit of length used informally to express astronomical distances. It is approxi ..more definition+
In relation to the base unit of [length] => (meters), 1 Light Years (ly) is equal to 9461000000000000 meters, while 1 Decameters (dam) = 10 meters.| 21000 Light Years | to common length units |
|---|---|
| 21000 ly | = 1.98681E+20 meters (m) |
| 21000 ly | = 1.98681E+17 kilometers (km) |
| 21000 ly | = 1.98681E+22 centimeters (cm) |
| 21000 ly | = 6.518405511811E+20 feet (ft) |
| 21000 ly | = 7.8220866141732E+21 inches (in) |
| 21000 ly | = 2.1728018372703E+20 yards (yd) |
| 21000 ly | = 1.2345464984491E+17 miles (mi) |
| 21000 ly | = 21000 light years (ly) |
| 21000 ly | = 7.5092040956478E+23 pixels (PX) |
| 21000 ly | = 1.24175625E+55 planck length (pl) |