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.
It speeds through the vacuum of space at 186,400 miles (300,000 km) per second.
Why can light travel through a vacuum but sound Cannot?
In the vacuum of space, there are no (or very, very few) particles to vibrate, so sound cannot travel through this medium. Radio waves travel perfectly fine through a vacuum because they are a type of electromagnetic wave (light), and electromagnetic waves do not need a medium to travel through.
Can light be seen in a vacuum?
Light is not visible in a vacuum. We can see real objects only when they are within light field or waves created by a light source however some animals like bats may be able to ‘see’ objects through sound waves.
Does light travel faster through a vacuum or through 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.
Can radio waves travel through a vacuum?
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space. This proved that radio waves were a form of light!