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" Once in a while, the universe lets you be free alone and in peace. "

John M. Grunsfeld

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" The most striking thing to me about human space flight and my own personal experience is that I've seen dramatic changes on Earth. We humans are rapidly changing the planet. I've watched Amazonia as the rainforest has been cut down. That's something I've seen out the window. I'm very worried about that. "

John M. Grunsfeld

" We're being very careful that we don't send a spacecraft to Mars with the intention of detecting Martian life - and find out that we detected the Earth life that we took with us. "

John M. Grunsfeld

" Hubble has really opened our eyes to what the universe is made of, its structure, and has helped us learn how little we know about the universe. "

John M. Grunsfeld

" Because of Hubble and other telescopes, we've now discovered that there are probably planets around every star, or virtually every star. There are solar systems around most stars. And the fact that we're here on a planet, Earth, means that it's likely there's lots of other Earths out there. "

John M. Grunsfeld

" Our country... invests a tiny fraction of 1 percent in NASA, and this is what's so amazing to me, is with that small investment, we do so much for the country. "

John M. Grunsfeld

" We don't know how many planets we're going to have to examine before we find life, and not finding it on 10 or 100 doesn't mean it's not there. This may be very tricky. "

John M. Grunsfeld

" I'm an incurable romantic. But I'm not an adrenaline junkie. "

John M. Grunsfeld

" I don't particularly want to jump out of an airplane with a parachute if I don't have to. I don't want to go bungee jumping. I like adventure with a real purpose that I can buy into. "

John M. Grunsfeld

" I have dedicated my life to answering the great scientific questions of our time and to the incredible adventure of space exploration. "

John M. Grunsfeld

" There are some things worthy of risking your life for. "

John M. Grunsfeld

" I have had the privilege to be a member of many high-performance teams at NASA, both on and off the planet. "

John M. Grunsfeld

" I grew up on the south side of Chicago in the 1960s, and I think there was a synchronicity of events that inspired me to be an astronaut, and, of course, the backdrop is nothing less than Mercury, Gemini, and Apollo. That was a time in our nation where we aspired to great things, and we achieved them. "

John M. Grunsfeld

" When I grew up as a kid, we didn't know there were any other planets outside of our own solar system. It was widely speculated that planet formation was an incredibly rare event and that it's possible that other planets just don't exist in our galaxy, and it's just this special situation where we happen to have planets around our sun. "

John M. Grunsfeld

" I look forward to working with the NASA team to help enable new discoveries in our quest to understand our home planet and unravel the mysteries of the universe. "

John M. Grunsfeld

" Once we get beyond Mars, which formed from the same stuff as Earth, the likelihood that life is similar to what we find on this planet is very low. "

John M. Grunsfeld

" If I could live in space, I would definitely do that. "

John M. Grunsfeld

" The Hubble Space Telescope, which was designed for extreme servicing, you know, we can fix everything. And the James Webb Space Telescope, where we can fix nothing. It has to work the first time. And it's a very complicated telescope. "

John M. Grunsfeld

" The Hubble Space Telescope is more than remarkable. It has answered just so many of those fundamental questions that people have been asking about the cosmos since people were able to ask questions. "

John M. Grunsfeld

" Sometimes astronauts feel a little ill or get minor scrapes. I trained as a crew medical officer to do basic treatment. "

John M. Grunsfeld

" To help enable the kind of science Hubble is performing makes my life worthwhile. "

John M. Grunsfeld

" As a young boy growing up on the South Side of Chicago, I was inspired by the nascent space age. "

John M. Grunsfeld

" Getting a team of scientists on Mars could be transformative. "

John M. Grunsfeld

" Hubble uniquely has been able to look in the atmosphere of a planet orbiting a nearby star and figure out what's in that atmosphere. "

John M. Grunsfeld

" The surface of Mars is bathed in ultraviolet light, bathed in radiation. Mars's magnetic field is essentially gone, so the surface of Mars is essentially sterilized. "

John M. Grunsfeld

" I can't imagine anywhere I'd rather be than outside the space shuttle in my space suit next to the Hubble Space Telescope. "

John M. Grunsfeld

" I thrive with high-performance challenges in front of me. "

John M. Grunsfeld

" Asteroid detection, tracking, and defense of our planet is something that NASA, its interagency partners, and the global community take very seriously. "

John M. Grunsfeld

" A deep ocean under the icy crust of Ganymede opens up further exciting possibilities for life beyond Earth. "

John M. Grunsfeld

" I kind of feel like I found my cause in life servicing the Hubble Space Telescope. "

John M. Grunsfeld

" Absolutely the most fun thing to do in space and rewarding thing, in many ways, is to look back at planet Earth. "

John M. Grunsfeld