However, sound cannot travel through a vacuum. Here's why:
* Sound is a mechanical wave: Sound travels as vibrations that need a medium (like air, water, or solids) to propagate. These vibrations cause molecules to bump into each other, transferring energy.
* Vacuum lacks a medium: A vacuum, by definition, is a space completely devoid of matter. Since there are no molecules to vibrate, there's nothing for sound waves to travel through.
Think of it this way: If you shout in a vacuum, there's nobody to hear you!
In summary: Light is an electromagnetic wave and doesn't need a medium to travel, while sound is a mechanical wave that requires a medium. This is why we see the sun and moon but can't hear them.
