MESSENGER’s interplanetary trajectory includes six planetary flybys and six large bi-propellant burns to achieve Mercury orbit in 2011. MESSENGER is about to complete the leg of the trajectory between the first and second Mercury flybys. This leg also included Deep-Space Maneuver 3 (DSM-3), a 72.5 meters per second bi-propellant maneuver executed on March 19, 2008. Credit: NASA/Johns Hopkins University Applied Physics
