Cherenkov Ultra Blue. I find these pictures inspiring and actually quite soothing.
This is my favorite color, Cherenkov radiation blue. In short, a charged particle goes through a substance moving faster than whatever the speed of light is in that substance. The particle excites electrons, and when it passes and they return to their natural, unexcited state, they emit photons — this wonderful blue glow.
Thanks to NASA for the excellent photo.
(Source: g-d-w)
