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nounthe distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers
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Definition that contains light year
- altair double star 15.7 light years from Earth; the brightest star in the Aquila constellation
- proxima the nearest star to the sun; distance: 4.3 light years
- parsec a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years
- canopus supergiant star 650 light years from Earth; second brightest star in the sky
- proxima centauri the nearest star to the sun; distance: 4.3 light years
- secpar a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years
- absolute magnitude (astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth
- denebola a star in Leo approximately 43 light years from Earth