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light year |
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light yearDistance travelled by a beam of light in a vacuum in one year. It is equal to approximately 9.4605 × 1012 km/5.9128 × 10 12mi. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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By comparison, Barnard's star resides 6 light-years away, and our nearest neighbor, at a distance of 4 light years, is the system of three stars collectively known as Alpha Centauri. 1 light years from Earth - the closest star yet to have its own world. The pictures unveil previously hidden features of a supernova remnant near the constellation Cassiopeia and a jet of radiation 6 billion light years away from Earth. |
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