3MV
SOVIET UNCREWED PROBE DESIGN
3MV planetary probe; 3MV-4; 3MV (spacecraft)
The 3MV planetary probe (short for 3rd generation Mars-Venus) is a designation for a common design used by early Soviet unmanned probes to Mars and Venus. It was an incremental improvement of earlier 2MV probes and was used for Zond 1, Zond 2 and Zond 3 missions to Mars as well as several Venera probes.