http://www.spacedaily.com/news/marsexpress-05a.html

It has been discovered for the first time an air glow in Mars, like those that occur in Earth. I thought that it could be interesting

Hum,
And as seen in the atmosphere of Venus…

The weird process for today is <i>`electron ultraviolet photodissociation’</i>
(er, the break-up of oxygen, nitrogen and carbon dioxide molecules by ultraviolet light. And when the separate atoms are transported to the nightside, recombine, releasing energy in the form of photons.)

Ah! If only Cole Porter were still alive he could write a romantic song.