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词汇 Light hour
分类 英语词汇 英语翻译词典
释义

Light hour

中文百科

光秒 Light-second

（重定向自Light hour）

光秒是一个借用了光速恒定不变的概念，再加上秒的定义而成的大尺度距离单位，被定义为光在真空中一秒时间内所行走的距离，是国际通用度量衡单位之一，常见于天文学和电讯上。

根据现时国际度量衡局的定义，一光秒恒定于299 792 458米。以光秒为基础，我们还可以导引出其他单位的长度，小至光纳秒到较长的光分、光时和光日。这些单位，不时都会在科普出版物里出现。

英语百科

Light-second 光秒

（重定向自Light hour）
The yellow shell indicating one light-day distance from the Sun compares in size with the positions of Voyager 1 and Pioneer 10 (red and green arrows respectively). It is larger than the heliosphere's termination shock (blue shell) but smaller than Comet Hale-Bopp's orbit (faint orange ellipse below). Click on the image for a larger view and links to other scales.
The faint yellow sphere centred on the Sun has a radius of one light-minute. For comparison, sizes of Rigel (the blue star in the top left) and Aldebaran (the red star in the top right) are shown to scale. The large yellow ellipse represents Mercury's orbit.

The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in one second, and is equal to exactly 299792458 metres (just over 186282 miles).
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