How fast can light travel in a year?

Answer 1

In a vacuum, light always travels at the same speed, approximately 3 x 10^8 meters/second.

In a year, there are 31556736 seconds, so light travels 9.5 x 10^15 meters.

That unit is called a light year.

More details are available at:

http://en.wikipedia.org/wiki/Light-year

Answer 2

The speed of light does not travel because it is a quantity not a physical thing.

Light however, travels a distance of 9.4605284e15 meters each year. This distance is conveniently known as a light year.

Answer 3

The speed of light is constant - at 186282 miles per second. However - IF you meant how far can light travel in a year - a light year is defined as approximately 5.9 trillion miles.

Answer 4

The speed of light is different in different media. It travels slower in media that have a higher refractive index than it does in vacuum. However, in any particular medium, the speed of light remains a constant: it is not like a runner who will get tired after running for some time. In a uniform medium, light will travel just as fast at the start of a year as it will at the end of the year.

Answer 5

Light travels at the same speed continuously, as long as it stays in the same

substance. So if there is a beam of light traveling through the vacuum of space,

for example, then its speed is the same at every point in a light year of distance,

and at every instant in a year's time.

That speed is

299,792,458 meters (186,282 miles) per second.

Answer 6

One light year (by definition) of distance or 9.4605284E15 meters in vacuum.