NASA sent astronauts to fix or upgrade the Hubble Space Station five times since it launched in 1993. As of now, it looks like JWST will be too far away to ever be serviced should something go wrong. This 2009 shows astronauts John Grunsfeld, left, and Andew Feustel working on the HST during the first of five STS-125 spacewalks. (NASA)
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