Electromagnetism

        Last night I found a nice site for Astronomy Podcasts called Astronomy Cast and downloaded “Electromagnetism” lecture and listened to it while on my evening walk. They talked about the history of magnetism and the Electromagnetic Theory developed by Maxwell who tied light, magnetism, and electricity as being the same phenomena. The massless, chargeless Photon, I learned, is the intermediary of electromagnetic radiation in all wavelengths and at different energies. There was a little talk about Virtual Particles and magnetic fields, which I’ll have to investigate later. Also discussed were black holes with accretion disks; how electromagnetism causes flares that shoot off into space at its poles. The lecture was only thirty minutes and packed with lots of information.