https://www.conservapedia.com/api.php?action=feedcontributions&feedformat=atom&user=Jesuslovesus 2026-10-14T08:54:17Z User contributions MediaWiki 1.35.14 https://www.conservapedia.com/index.php?title=Speed_of_light&diff=96146 2007-04-09T22:29:57Z

<p>Jesuslovesus: </p> <hr /> <div>The speed of light in a vacuum (postulated to be constant for all inertial observers by the [[Theory of Relativity|special theory of relativity]]) is, to nine significant figures, exactly 299,792,458 meters per second (approximately 186,282.3 miles per second). As the speed of light is used to define the [[SI]] meter, this is the value ''by definition''.<br /> <br /> The speed of light is slower in any medium which is not a vacuum, and varies from medium to medium. This variation gives rise to (as a result of [[quantum mechanics]], particularly the concept of a path of least action) the phenomenon of [[refraction]]. When a charged particle exceeds the speed of light in the medium in which it is travelling, it emits [[Cherenkov Radiation]].<br /> <br /> Since the speed of light in a vacuum is constant, it can be used to define distances as well. The distance that light travels in one year is known as a [[light-year]], which is about 6 million million (6x10&lt;sup&gt;12&lt;/sup&gt;) miles. For instance, the nearest large galaxy to our own [[Milky Way Galaxy]] is the [[Andromeda Galaxy]], which astronomers have measured to be about 2.5 million light years away, meaning visible light from the galaxy has taken 2.5 million years to reach Earth.<br /> <br /> The speed of light raises several questions for [[Young Earth Creationism|Young Earth Creationists]] including that of the [[starlight problem]].<br /> <br /> It is also a well known bible fact that the speed of light is the maximum speed at which Jesus can run at.<br /> <br /> [[category: astronomy]]</div>

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