FOS meaning in Space Science ?

Answer: What is Faint Object Spectrograph mean?

The Faint Object Spectrograph (FOS) was a spectrograph installed on the Hubble Space Telescope. It was replaced by the Space Telescope Imaging Spectrograph in 1997, and is now on display in the National Air and Space Museum in Washington DC.

reference

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Forensic and Osteoarchaeological Services	Academic & Science
Front Of Store	Academic & Science
Florida Ornithological Society	Academic & Science
Forrest	Airport Code
Factory Outlet Store	Business
Furniture Online Shop	Business
PhosCan Chemical Corporation	Business
Financial Origination System	Business
Fructo-oligosaccharide	Chemistry
Friends Of Scouting	Community
Friends Of Stern	Community
Found On Shelf	Community
Financial Ombudsman Service	Community
Festival of Speed	Community
Open Scouting	Community
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File Output Stream	Computing
Fedora Operating System	Computing
Free Online Scholarship	Computing
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File Organization System	Computing
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Friend Of Sauce	General
Fortress Of Solitude	General
The Fisheries Operation System	General
Flight Operation Security	General
Full Of Sh*t	General
Friends Of Symfony	General
Fleet Online Solutions	General
Friends of the Sheriff	General
Ford Of Sweden	General
Friend of the Sea	General
Ford Of Spain	General
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Foundations of Success	General
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Flight Operations System	General
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Forward Observer System	Military and Defence
Forrest, Western Australia, Australia	Regional
Fundamental Operating System	Softwares
Faint Object Spectrograph	Space Science
Flight Operations Support	Space Science
Feat of Strength	Sports