Mariner 10 image mosaic, by Mark Robinson, NWU. Download a large (123K) or a very large (5.2 M) version. Mission News MESSENGER Team Readies for Spacecraft Development Progress continues on the MESSENGER mission, as team members build flight hardware and prepare to integrate parts on the spacecraft this fall. Mercury, the least explored terrestrial planet, is fundamental to understanding the ...

Discovery Missions Under Consideration Three missions were originally under consideration for selection as the fourth Discovery mission. These were the Stardust comet mission, the Suess-Urey solar wind mission, and the Venus Multi-Probe mission. After an evaluation of these missions the Stardust mission was chosen in November 1995. For more details on this mission, see the NSSDC Stardust Page.