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In page Europa (moon):

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The atmosphere of Europa was first discovered in 1995 by Hall Al and the Goddard High Resolution Spectrograph of the Hubble telescope. This observation was then confirmed in 1997 by the Galileo probe, built by Hughes Aircraft Company and operated by NASA. The Galileo probe flew only three miles above the estimated maximum atmospheric line (190 km from Europa's surface). Still, it then changed course to collide with Jupiter's atmosphere to prevent unwanted impact on Europa's surface. It has been speculated that there will be several more future missions to Europa in hopes of further studying the atmosphere, chemical composition, and possibility of extraterrestrial life below the icy surface.[citation needed]