Believe you posted to this ng about "What if the Moon had a blue light on
it?". Just ran across this article which you may find of interest.

From http://stardate.org/radio/ 28 May 04.

"Lunar Transient Phenomena
As the Moon descends the western sky this evening, it looks calm and
unchanging. No clouds waft across its surface, no ice caps wax and wane at
its poles, no bright cities blink to life at night.

Yet over the centuries, amateur and professional astronomers have found
signs that the Moon occasionally stirs a little bit. They've reported
hundreds of bright flashes of light, colorful glows, and patches of haze.

These events are called Lunar Transient Phenomena -- LTPs for short. They've
been observed at more than 200 different spots on the Moon, but most are
associated with just a few regions. About a third come from the Aristarchus
Plateau, a region that includes two large craters and a deep volcanic
valley.

William Herschel, one of the greatest astronomers in history, observed
several LTPs in Aristarchus in the 1780s. He thought they were volcanic
eruptions. Today, though, geologists think that's unlikely.

But there's no widely accepted explanation for LTPs. They may be caused by
small "burps" of gas breaking through the surface. Indeed, the Apollo
missions found thin wisps of a radioactive gas around Aristarchus. Other
possible explanations include a glow caused by energetic particles from the
Sun, or discharges of energy from rocks that suddenly break apart.

But until scientists can once again land on the Moon -- particularly in
Aristarchus -- the mystery of Lunar Transient Phenomena may remain
unsolved."