WVES was created in 1990.
the #1 good fact about TV is that you can learn a couple of things from it the #2 good fact about TV is that you can learn things for what you want to be when you grow older or when you can look for things. there are a lot of things bad bout TV but not a lot.
Because different objects give out electromagnetic radiation at different frequencies. Some objects are very easily viewed in the visible spectrum, others are essentially invisible in that spectrum. Also, some types of electromagnetic radiation can more easily penetrate dust and other debris between the source and Earth. Visible light is very easily blocked by dust, but x-rays for example can pass through them pretty much intact.