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The Diffuse X-ray Spectrometer (DXS) instruments were flown
as attached payload on the STS-54 mission of the Space Shuttle
Endeavour in January of 1993. The DXS's main scientific goal
was to obtain spectra of the diffuse soft X-ray background.
The DXS project yielded the first direct evidence that there
is very hot gas in the interstellar medium near the solar
system and obtained the first-ever spectra of the diffuse
soft x-ray background in the energy band from 0.15 to 0.284
keV (wavelength 42 to 84 Angstroms). .
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