Question

how does light travel

Answer 1

light travels in a straight line in atmosphere

Answer 2

Nothing that we know of travels faster than light. But how exactly does light move so quickly? Does it travel in waves like sound or in little particles? In this lesson, we'll investigate the scientific facts behind how light travels.

The Fastest Thing in the Universe

What moves faster than anything else in the world? Is it a cheetah, a jet, or a sports car? It definitely isn't you doing your chores! So what is it? Believe it or not, it is light! Light travels at 186,000 miles per second!

If you moved as fast as light, you could run all the way around the Earth 7.5 times in one second. So how can light move like that? Well, it isn't because of fancy new sneakers or extra muscles. Before we clear this up, let's take a closer look at what light really is.

Light Is Energy

We all know that light is an important part of our lives. The light from the sun brightens up our days. Light from electricity helps us see in the dark, watch television, use our cell phones, and play on our computers. Life without light would be pretty dull.

Light is a form of energy, like heat and sound. But what is really unique about light is how it travels and how it gets from one place to another so quickly. Think about this: sound is really fast too. It can travel a mile in about five seconds. But remember, light goes 186,000 miles in one second!

How Does Light Move?

For a very long time, scientists weren't sure exactly how light traveled. They figured out that sound traveled in waves, but light was more of a mystery. Some thought that light also traveled in waves (kind of like the waves a rock makes when you throw it in a lake), but others thought it moved in little particles. To imagine particles, think of tiny specks of dust.



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