As the article says, astronomy makes excellent use of radio waves and other electromagnetic waves for viewing heavenly bodies that are outside of our visual spectrum. Thanks to radio waves, telescopes can capture images of things like nebulas that might not even look like they're there if someone goes out and looks for one.
Space operates very much on magnetism. The sun's sunspot cycle is even controlled by magnetic waves -- which telescopes can view twisting and bending around if they use the right magnetic imaging technique. I've viewed some of these magnetic telescopic images, and it's just amazing to imagine those waves happening right inside of the sun by us every day.
Magnetic things fascinate me a lot. I hope that astronomy keeps making leaps and bounds in what their electromagnetic telescopes can do.