MYSTERIOUS “acne spots” on the moon may be the splattered remains of a giant impactor.
Hundreds of regions of magnetised rock dot the moon’s surface, mostly on the far side. This is a real puzzle, since the lunar crust is made up of minerals that are hard to magnetise. These minerals floated to the surface when the infant moon was still molten after its birth in a violent run-in between Earth and another planet. Heavy, magnetisable metals such as iron would have sunk down to its core.
Now of Paris Diderot University in France and colleagues say…
