Unique Process Formed a Strange Lunar Dome

We tend to think of the Moon as a boring old rock.  “We’ve been there, so we know all there is to know, onto the next one.” But the Moon still holds secrets, and has its surprises.  The formation of the Moon through collision of proto-Earth with a Mars-sized object is an idea that can give us a lot of insight into how the Earth formed and what raw materials we started with.  But of course to study it we have to see what the Moon is made of in addition to what the Earth’s rocks contain. In recent years,...