After 10 years and over 4K orbits of Mercury, Messenger will (as planned) crash into the planet and finish its mission, at 3:26ET today. A great success!
Launched in September 2007, it visited dwarf planet Vesta for a year. Now it has moved on to Ceres, the largest body in the asteroid belt between Mars and Jupiter. Amazing first 3D high resolution photo;
And it has ION engines…