Commemorative cover with a color cachet honoring the launch of the Particles and Fields Subsatellite (PFS-1) during the Apollo 15 mission, signed in blue or black felt tip by Jim Irwin, Al Worden, and Dave Scott. In very fine condition.
The Apollo 15 Particles and Fields Subsatellite (PFS-1) was a small satellite released into lunar orbit from the SIM bay just before the mission left orbit to return to Earth. Its main objectives were to study the plasma, particle, and magnetic field environment of the Moon and map the lunar gravity field.
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