Europe's Rosetta spacecraft is buzzing Earth today. Closest approach: 5301 km above the south Pacific Ocean at 20:57 UT on Nov. 13th. The gravity assist maneuver will boost Rosetta toward Comet 67/P Churyumov-Gerasimenko where, approximately 7 years from now, Rosetta will orbit the comet's icy nucleus and deploy a lander to explore the surface.