Orbiting Solar Observatories Gallery
The OSO series
![*](https://webarchive.library.unt.edu/eot2008/20080921132034im_/http://heasarc.gsfc.nasa.gov/Images/heasarc/icons/orangeball.gif)
Display model of an OSO satellite (National Air and Space Muesum,
Washington, D.C.)
OSO 1
OSO 2
OSO 3
![*](https://webarchive.library.unt.edu/eot2008/20080921132034im_/http://heasarc.gsfc.nasa.gov/Images/heasarc/icons/orangeball.gif)
Diagram of the low energy gamma-ray detector flown on OSO-3
Diagram of the high energy gamma-ray detector flown on OSO-3
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.
OSO 4
OSO 5
OSO 7
![*](https://webarchive.library.unt.edu/eot2008/20080921132034im_/http://heasarc.gsfc.nasa.gov/Images/heasarc/icons/orangeball.gif)
OSO-7 before attaching the solar panels and instruments
Diagram of the UCSD gamma-ray detector flown on OSO-7
OSO 8
![*](https://webarchive.library.unt.edu/eot2008/20080921132034im_/http://heasarc.gsfc.nasa.gov/Images/heasarc/icons/orangeball.gif)
Diagram of the Cosmic X-ray Spectrometer
Diagram of the High Energy Celestial X-ray Experiment (HEXCE),
also known as the Frost experiment.
Diagram of the HEXCE,
including a overhead view of both detector crystals.
The photograph of OSO-8 under construction is courtesy of Hughes Aircraft Company. All other images are courtesy of NASA.
[About OSO 5] [About OSO 6] [About OSO 7] [About OSO 8]