light-year

noun Date: 1888 1. a unit of length in astronomy equal to the distance that light travels in one year in a vacuum or about 5.88 trillion miles (9.46 trillion kilometers) 2. an extremely large measure of comparison (as of distance, time, or quality) <
seems like light-years ago
>
<
has light-years more talent
>
<
two minutes and yet light-years away from the crowded village — Suzanne Patterson
>

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Light year — Light year, Light year Light year (Astron.) 1. The distance over which light can travel in a year s time in a vacuum, 5.88 trillion miles (9.46 trillion kilometers); used as a unit in expressing stellar distances. It is more than 63,000 times as… …   The Collaborative International Dictionary of English

  • Light-year — Light year, Light year Light year (Astron.) 1. The distance over which light can travel in a year s time in a vacuum, 5.88 trillion miles (9.46 trillion kilometers); used as a unit in expressing stellar distances. It is more than 63,000 times as… …   The Collaborative International Dictionary of English

  • Light-year — For other uses, see Light year (disambiguation). Image showing the scale of a light year (outer shell) and a light month (inner shell) surrounding the Sun compared to Comet 1910 A1 s orbit (yellow line) and Comet Hyakutake s orbit (orange line).… …   Wikipedia

  • Light year (disambiguation) — Light year may refer to: *Light Years, Alternative, Neo Grunge, Experimental rock band from Long Island, NY. * Light year, a unit of length, the distance light travels in a vacuum in one year * Lightyear (band), a ska punk band from the United… …   Wikipedia

  • Light-second — A light second is a unit of length. It is defined as the distance light travels in an absolute vacuum in one second or 299,792,458 meters. Note that this value is considered exact, since the meter is actually (as of 1983) defined in terms of the… …   Wikipedia

  • Light-week — A light week (also written light week) is a unit of length. It is defined as the distance light travels in an absolute vacuum in one week (seven days of 86,400 seconds each) or 181,314,478,598,400 metres ( 181 Tm).Note that this value is exact,… …   Wikipedia

  • Light-month — A light month (also written light month) is a unit of length. It is defined as the distance light travels in an absolute vacuum in one full month (thirty days of 86,400 seconds each) or 777,062,051,136,000 metres ( 777 Tm). Explanation Note that… …   Wikipedia

  • Light-day — A light day (also written light day) is a unit of length. It is defined as the distance light travels in an absolute vacuum in one day (of 86,400 seconds) or 25,902,068,371,200 metres ( 26 Tm).Note that this value is exact, since the metre is… …   Wikipedia

  • Light-hour — A light hour (also written light hour) is a unit of length. It is the distance travelled by light in vacuum in one hour. Based on the current definition of the metre a light hour is equal to 1,079,252,848,800 metres ( 1.08 Tm).This distance can… …   Wikipedia

  • Year — A year (from Old English gēar) is the orbital period of the Earth moving around the Sun. For an observer on Earth, this corresponds to the period it takes the Sun to complete one course throughout the zodiac along the ecliptic. In astronomy, the… …   Wikipedia

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