How does light travel in a vacuum?
Light travels as a wave. But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum—a completely airless space. (Sound, on the other hand, must travel through a solid, a liquid, or a gas.)
How fast does it travel in a vacuum?
In a vacuum, EM waves travel at a constant speed, and they travel very fast—about 300,000 kilometers (186,000 mi) per second.
Does light travel faster through air or a vacuum?
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.
How long would it take to travel 31 light years?
It should then take you 279 trillion kms/40,000 km/hr= 6,975,000,000 hrs which translates to 796,232 years. Apart from that if you come up with something that can achieve speeds upto the speed of light then it will take you 31 years.
Is it possible to travel faster than light?
As an object approaches the speed of light, its mass rises precipitously. If an object tries to travel 186,000 miles per second, its mass becomes infinite, and so does the energy required to move it. For this reason, no normal object can travel as fast or faster than the speed of light.