Last modified on 9th August 2000.

Encyclopædia Galactica

- Encyclopædia

Light year (ly)

Light year is the distance light travels in one year. The speed of light is about 300,000 km/s, so during one year the light travels about 9500 billion km (5900 billion miles). One would have to drive around the Earth on the equator 236 million times to get this many kilometres on the distance meter.

Back to Encyclopædia menu
Back to Encyclopædia Galactica main page

Created by Rami T. F. Rekola