Goddard High Resolution Spectrograph

[2] One of the results was the discovery of tenuous atmosphere for Jupiter's moon Europa in 1995.

[3][4] The surface pressure of Europa's atmosphere is 0.1 μPa, or 10−12 times that of the Earth.

[5] An example GHRS use was to observe the local interstellar medium in the direction towards Capella.

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Space Shuttle Discovery heads into orbit during its 1990 STS-31 mission with the Hubble Space Telescope and its original instrument suite, including the High Resolution Spectrograph.
GHRS being removed during Servicing Mission 2. (1997)