Waves in Space!!! My physics class is studying waves at the moment. I was reading something in my book that I thought was rather interesting. Mechanical waves don't travel very well through space because space is nearly a vaccum. However, electromagnetic waves travel well through space. There are some kinds of elecrtomagnetic waves that can not escape the gravity of black holes, such as light waves. I was wondering why. Why can electromagnetic waves travle through space with relative ease, yet mechanical waves cannot? I know mechanical waves need an elastic medium to travel through, but isn't space a medium too? If it isn't why not? :uhh: Just some food for thought.