Toward the top (northern) end of the image, the ice becomes sparser, but the walls of a large impact crater in the upper-left corner provide a refuge for an oblong ice deposit on the crater floor.
If we had rock samples to study, we'd know whether these small craters were formed by impacts during the final stages of planetary formation, or if they resulted from later meteor showers.
Computer simulations of this impact show that both of the objects would melt in the impact and the dense core of the impactor would fall as molten rock into the liquefied iron core of Earth.
A trailing spacecraft then flew through the cloud of debris and dust thrown up by the collision and used its instruments to analyze what was inside before it also struck the moon.
The minor collision took place at around 10pm on July 3 last year as she returned from visiting people made homeless by a fire in a towerblock that killed six people.