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- the third Small Astronomy Satellite that was used to determine the location of bright x-ray sources
- Roentgen Satellite, dedicated to the All Sky Survey, a joint German, British, and American venture
- the third Japenese x-ray mission in 1987-1991, carried the LAC (Large Area Counter)
- NASA's Small Astronomy Satellite launched from Kenya
- Compton Gamma Ray Observer in 1991-2000, it was NASA's Second Great Observatory to observe the EM spectrum
- Rossi X-ray Timing Explorer, studied time resolution of x-rays in combination with moderate spectral resolution to explore the variability of x-rays
- a British and American collaboration of an x-ray mission, monitored the x-ray sky from 1974-1980
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