The Trough

theweekmagazine:

NASA’s latest lunar exploration will give us a never-before-seen glimpse of the moon below the surface

 

Though the moon is our closest neighbor in space, there’s much we don’t know about it. For instance: Did a second moononce crash into our moon, destroying the second moon and leaving our moon pockmarked with craters? NASA hopes to shed light on this and other questions as it sends a lunar probe named GRAIL (Gravity Recovery and Interior Laboratory) to orbit the moon. Here, a brief guide to this mission.