http://en.wikipedia.org/wiki/Speed_of_light
The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its value is exactly 299,792,458 metres per second, a figure that is exact because the length of the metre is defined from this constant and the international standard for time.This is, to three significant figures, 186,000 miles per second, or about 671 million miles per hour. According to special relativity, c is the maximum speed at which all matter and information in the universe can travel. It is the speed at which all massless particlesand changes of the associated fields (including electromagnetic radiation such as light and gravitational waves) travel in vacuum. Such particles and waves travel at c regardless of the motion of the source or the inertial frame of reference of the observer. In the theory of relativity, c interrelates space and time, and also appears in the famous equation of mass–energy equivalence E = mc2.
Sunlight takes about 8 minutes 17 seconds to travel the average distance from the surface of the Sun to the Earth.
The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its value is exactly 299,792,458 metres per second, a figure that is exact because the length of the metre is defined from this constant and the international standard for time.This is, to three significant figures, 186,000 miles per second, or about 671 million miles per hour. According to special relativity, c is the maximum speed at which all matter and information in the universe can travel. It is the speed at which all massless particlesand changes of the associated fields (including electromagnetic radiation such as light and gravitational waves) travel in vacuum. Such particles and waves travel at c regardless of the motion of the source or the inertial frame of reference of the observer. In the theory of relativity, c interrelates space and time, and also appears in the famous equation of mass–energy equivalence E = mc2.
Sunlight takes about 8 minutes 17 seconds to travel the average distance from the surface of the Sun to the Earth.
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