National Aeronautics and Space Administration

Small Astronomical Satellite 2 (SAS-2) Gallery

Artist's conception of SAS-2 in flight

SAS-2 satellite in the clean room

SAS-2 being weighed

The SAS-2 gamma-ray spark chamber

Diagram of the SAS-2 gamma-ray spark chamber

The spectrum of the diffuse gamma-ray background in the 0.001 - 100 MeV energy range as measured by OSO-3, Rangers 3 & 5, Apollo 15, and SAS-2.