"This is a really tremendous adventure that we’ve been on, a very challenging mission. Hubble isn’t just a satellite - it’s about humanity’s quest for knowledge...A tour de force of tools and human ingenuity. On this mission in particular, the only way of finding the limits of the possible is by going beyond them into the impossible. On this mission, we tried some things that some people said were impossible….We’ve achieved that, and we wish Hubble the very best. It’s really a sign of the great country that we live in that we’re able
to do things like this on a marvelous spaceship, like space shuttle Atlantis. I’m convinced that if we can solve problems, like repairing Hubble, getting into
space, doing the servicing we do, traveling 17,500 mph around the Earth, we can achieve other great things, like solving the energy problems and climate problems- all of the things that are in the middle of NASA’s prime and core values. As Drew and I go into the airlock, I want to wish Hubble its own set of adventures and with the new instruments that we’ve installed that it may unlock
further mysteries of the universe."
John Grunsfeld, Last Hubble EVA 2009-05-18