Mars Odyssey
Status: Active
· Launch: April 7, 2001 · Arrived: October 24, 2001
Long-lived orbiter that discovered vast amounts of hydrogen indicating water ice just below the Martian surface. Still operational after more than two decades.
Key Achievements
Discovered subsurface water ice at high latitudes
Longest-operating spacecraft at Mars
Serves as communications relay for surface missions
Longest-operating spacecraft at Mars
Serves as communications relay for surface missions