I’ve seen images from the Sun in all different wavelengths of light.  It looks very different across the electromagnetic spectrum, with some wavelengths making up more of the Sun’s total energy output than others.  What’s always striking to me is seeing the images of the Sun that show its structure, including the strange and beautiful features of plasma that dance across it’s surface.  A recent APOD captures just such a concept. This image shows the Sun in Hydrogen Alpha, a wavelength of light at 656 nanometres.  This is from the ionization of Hydrogen, where the electron is excited and transitions...