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Zenit-4 film-return reconnaissance satellite.
Zenit-2 film-return and ELINT reconnaissance satellite.
Satellite instrumented to study interplanetary magnetic fields, energetic particles, and plasma.
Lunar lander and sample return probe
The OGO (Orbiting Geophysical Observatory) series was a series of large, complex research satellites.
KH-8 or Gambit-3 was the second generation of Gambit high resolution reconnaissance satellites.
The DS-P1-Yu series of satellites was used to calibrate space surveillance and early warning radars.