Planetary scientists claim to have created a new gravity map of the moon which shows that the gravity pull changes from location to location over the surface of the Earth's natural satellite.

Map the Moon? But it has been studied for centuries!?
Yes but since the LRO began returning images showing images down to 1m, data has been piling up; And computers alone can't identify craters and stop to wander about curious formations. That why NASA now invites everyone to participate in the online mapping project Cosmoquest

Space scientists from the University of New Hampshire and multi-institutional colleagues report they have quantified levels of radiation on the moon’s surface from galactic cosmic ray (GCR) bombardment that over time causes chemical changes in water ice and can create complex carbon chains similar to those that help form the foundations of biological structures.

The majority of the lunar craters are supposed to originate from the Late Heavy Bombardement (LHB), that is supposed to have been an effect of the early planetary displacements. But CfA astronomer Matija Cuk propose another theory; That LHB was 'just" a meteor shower, but with a few concentrations, out of which one accidentually hit the Earth-Moon system