APOD 3.1

This multi-wavelength photo of the sun was taken on December 21 of 2013 from the Solar Dynamics Observatory (SDO). It spans from visible to ultraviolet wavelengths (farthest left pink portion). You can see the many different parts of the photosphere, the "surface of the sun", in the photo. You can also see multiple sunspots, prominences, and even the whisp of the corona around the edge. I selected this picture because we just finished studying the Sun in astronomy so it only seemed appropriate to pay homage to the "mass of incandescent gas" that heats our Earth.