GRAIL ‘Rings’ in 2012 on This Week @NASA 0 Randall Gross ScienceJanuary 2012Friday, January 13, 2012 at 5:29 am PST • Views: 987 Heavy lift, Orion, and Comet Lovejoy GRAIL Gravity Recovery Lunar Orbit Spacecraft STS-81 Titans Comet Booster Day