Light Year (l.y.)

Details Light Year (l.y.) Light Year (l.y.)

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4564.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4564. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Coordinates, Time, And Motion, Positional Concepts

Scientific paper

A unit of distance measurement equal to the distance traveled by a ray of light in vacuo in one year. Since light travels at a speed of 299 792 458 m s-1 (186 282 miles s-1), this distance is equivalent to 9.46×1012 km (i.e. 9.46 million million km) or 63 240 astronomical units. The unit is commonly used to express large distances in the universe and represents the time taken for a ray of light t...

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