Facts behind Light

Light can circle our planet about seven and a half times in a single second.
It takes light about 1.3 seconds to travel from Earth to the moon
The speed of light in a vacuum is 186,282 miles per second  i.e 299,792 kilometers per second, and in theory nothing can travel faster than light.

Light travels at a constant, finite speed of 186,000 mi/sec. A traveler, moving at the speed of light, would circum-navigate the equator approximately 7.5 times in one second.

What is a light-year and how long is it ?

The speed of light can cause the universe to seem to host a time machine. The distance light travels in the course of a year is called a light-year. A light-year is a measure of both time and distance. It is not as hard to understand as it seems. Think of it this way: Light travels from the moon to our eyes in about 1 second, which means the moon is about 1 light-second away. Sunlight take about 8 minutes to reach our eyes, so the sun is about 8 light-minutes away. Light from the nearest star system, Alpha Centauri, is requires roughly 4.3 years to get here, so that star system is said to be 4.3 light-years away.

The light-year is a measure of distance, not time. It is the total distance that a beam of light, moving in a straight line, travels in one year. To obtain an idea of the size of a light-year, take the circumference of the earth (24,900 miles), lay it out in a straight line, multiply the length of the line by 7.5 (the corresponding distance is one light-second), then place 31.6 million similar lines end to end. The resulting distance is almost 6 trillion (6,000,000,000,000) miles!!

Can something travel faster then light ?

300000 km/sec -  speed of light
1 light year = 9 mil mil km

According to Einstein's general theory of relativity, as an object moves faster, its mass increases, while its length contracts. At the speed of light, such an object has an infinite mass, while its length is 0 — an impossibility. Thus, no object can reach the speed of light, the theory goes.