JoinScope on the Skies: GRACE, GRAIL, and Gravity
This column focuses on astronomy throughout the year. This month’s issue discusses two NASA missions that were launched to get a better understanding of what lies beneath the surface of the Moon and the Earth. The missions, which each consist of a pair of orbital satellites, have given us a better understanding of differentiation, the process responsible for the distribution of materials within a rocky planet, moons, and some asteroids.