| 释义 |
light year
light year also light-year n. 1. The distance that light travels in a vacuum in one year, approximately 9.46 trillion kilometers (5.88 trillion miles). 2. often light years Informal A long way: a small town light years away from the action of the capital. light year n (Units) a unit of distance used in astronomy, equal to the distance travelled by light in one year, i.e. 9.4607 × 1012 kilometres or 0.3066 parsecs light year - Not a length of time but a distance, the distance a pulse of light travels in one year (about 5.88 trillion miles).See also related terms for pulse.light year1. (ly) The distance traveled by light in a year, equal to 5.878 trillion mi (9.4605 trillion km) or 63,290 au. Defined in 1888.2. A unit of length (distance) representing the distance traveled by electromagnetic waves (light) through space in one year. 1 light year = 9 trillion miles.Thesaurus| Noun | 1. | light year - the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometerslight-yearastronomy unit - a linear unit used for astronomical distanceslight hour - the distance light travels in a vacuum in one hour; approximately one billion kilometerslight minute - the distance light travels in a vacuum in one minute; approximately 18 million kilometerslight second - the distance light travels in a vacuum in one second; approximately 300,000 kilometers |
Translationslight year
light year a unit of distance used in astronomy, equal to the distance travelled by light in one year, i.e. 9.4607 × 1012 kilometres or 0.3066 parsecs light yearThe distance light travels in one year, which is approximately 5.9 quadrillion miles. Abbreviated "ly," light years are used to measure distances in the universe. For example, the galaxy is presumed to be about 100 ly across. Proxima Centauri, at about 4.22 ly from the sun, is the closest star to the sun.
It's About Distance, Not Time
Because the word "year" is used, light years are often erroneously used to measure time. The phrase "I spent light years doing that" might sound triumphant, but it is like saying "I spent a million miles doing that."light year
light year the distance light travels in one year, i.e. 5.9 x1012 miles.AcronymsSeelast yearlight year
Related to light year: black holeSynonyms for light yearnoun the distance that light travels in a vacuum in 1 yearSynonymsRelated Words- astronomy unit
- light hour
- light minute
- light second
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