GRAIL Now In Extended Science Mission

Extended Science Phase Of GRAIL Mission From 30 Aug – 3 Dec; Spacecraft Will Take Even Closer Look At Lunar Gravity Field By Dropping To Average Orbit Of 23km (Compared To 55-km Orbit On Primary Mission); Objective Of NASA Mission Is To Generate The Most Accurate Gravity Map Of Moon & From That Derive Its Internal Structure / Evolution

Image Credit: NASA