| 单词 | light year |
| 释义 | light year (once / 29184 pages) n In astronomy, a light year is the distance that light travels in a year. Informally, astronomers use the light year to describe distances between planets, stars, moons and other astronomical bodies. Light years are sometimes mistakenly thought of as units of time — because of the year — but they're actually units of distance, equal to about six trillion miles. In 1851, the light year was first used for defining distances by a German astronomer who compared it to a "hiking hour," or the distance a person can hike in one hour. The term can also figuratively mean "a long way:" "Our team is light years ahead of where they were last summer!" WORD FAMILYlight year: light years USAGE EXAMPLES“He’s light year ahead of what he was at OTAs,’’ said defensive end William Hayes, referring to the Rams’ spring workouts. Los Angeles Times(Jan 01, 2017) “Simon, the guy who did the Wham! thing was way ahead, light years ahead,” Bull says. Time(Dec 26, 2016) It has been precisely an hour since we left downtown Jackson, but I feel light years away. Washington Post(Nov 10, 2016) n the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers Syn|Hyper light-year astronomy unit a linear unit used for astronomical distances |
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