Located near the lunar north pole, Peary crater exhibits an extremely unusual condition.  Four mountainous regions around the rim of the crater appear to be illuminated for the entire lunar day.  These “peaks of eternal light” are the only known regions of constant light in our solar system (astronomers speculate that some places in Mercury may share these features, but no direct observations have been made).  The phenomenon results from the slightness of the moon’s rotational axis compared to the plane of its and the Earth’s orbit around the sun.  Because of this unique feature, the site has become an early favorite to be home to the first moon base.  Lunar Santa Claus is about to get his lunar north pole invaded.