Discovered more than a century ago, the electromagnetic spectrum is the basis on which our universe operates. Without it we wouldn’t be able to see, stars wouldn’t shine, and life would not exist.

In space since 1999, Chandra travels around Earth on an elliptical orbit that takes it as far as 83,000 miles ... How does astronomy use the electromagnetic spectrum? : Read more ...

There's lots to discover in the electromagnetic spectrum. Here's a tour that begins with radio waves and takes you through microwaves, infrared radiation, light, ultraviolet radiation, and X-rays.