light second
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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 second — a unit of distance equal to the distance light travels in a vacuum in one second. In accordance with the official definition of the meter, this distance is exactly 299 792 458 meters (about 186 282.4 miles). Similarly, a light minute is 60… … Dictionary of units of measurement
light second — noun the distance light travels in a vacuum in one second; approximately 300,000 kilometers • Hypernyms: ↑astronomy unit • Part Holonyms: ↑light year, ↑light year … Useful english dictionary
Light cone — in 2D space plus a time dimension. A light cone is the path that a flash of light, emanating from a single event (localized to a single point in space and a single moment in time) and traveling in all directions, would take through spacetime. If… … Wikipedia
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 — noun the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers • Syn: ↑light year • Hypernyms: ↑astronomy unit • Part Meronyms: ↑light hour, ↑light minute, ↑light second … Useful english dictionary
Light-minute — A light minute (also written light minute) is a unit of length. It is defined as the distance light travels in an absolute vacuum in one minute or 17,987,547,480 metres ( 18 Gm). Note that this value is exact, since the metre is actually defined… … 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-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-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
