# Why Does Light Travel So Fast?

What is the propelling force?

Light actually moves just as fast as everything else in the universe (Sort of).

The main characteristic of light is that it is mass less so in order to figure out what makes light move so fast you have to understand what it means to be mass less.

## Is it possible for anything to travel faster than the speed of light?

Einstein’s theory that nothing can travel faster than the speed of light in a vacuum still holds true, because space itself is stretching, and space is nothing. Galaxies aren’t moving through space and away from each other but with space—like raisins in a rising loaf of bread.

## How does light travel fast?

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.

## Why is light so fast?

A magnetic field cause the attraction between the North and South poles of a magnet. In light, the strength of these fields changes with time and place. Albert Einstein showed that light is the fundemental speed limit in the universe. Nothing with mass can move as fast as light.

## Is a black hole faster than light?

It is widely accepted that there is nothing that can travel that a speed greater than light due to Einstein’s theory of relativity. But from observational analysis of black holes it can be said that not even light can escape the event horizon of one.

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## Can light travel forever?

Nope! Light is a self-perpetuating electromagnetic wave; the strength of the wave can get weaker with the distance it travels, but as long as nothing absorbs it, it will keep on propagating forever.

## Does light travel faster in a vacuum or air?

You can do the same experiment with air. Light in air is 1.0003 times slower than light in a vacuum, which slows it all the way down from 299,792,458 meters per second to 299,702,547 meters per second.

## Is light faster than sound?

Light doesn’t need a medium to travel. The speed of sound through air is about 340 meters per second. It’s faster through water and it’s even faster through steel. Light will travel through a vacuum at 300 million meters per second.

## Can humans travel at the speed of light?

“There is no real practical limit to how fast we can travel, other than the speed of light,” says Bray. Light zips along at about a billion kilometres per hour. Therefore, humans should – in theory – be able to travel at rates just short of the “Universe’s speed limit”: the speed of light.