Photographer Miloslav Druckmuller artificially removed the blue sky around the sun's surface in this image of an eclipse. The result reveals the green hues of the inner ring, or inner corona, which gets its tint from a form of highly ionized iron known as "coronium."

In this photo, the corona becomes redder the farther it is from the sun. That's because dust particles deflect shorter wavelengths of light more than longer wavelenghts, so only long-wavelength light--i.e., red--finds its way to the camera.