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

John M. Grunsfeld

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" Being an astronaut, there are not a lot of things that have really shocked me in my life. "

John M. Grunsfeld

" Science at NASA is all about exploring the endless frontier of the Earth and space. "

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

" At the age of six, I declared that I wanted to be an astronaut. My mother thought that was just fine, as it would encourage me to learn science, and besides, there really was no chance I would ever actually become an astronaut. "

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 was not really scared on my spacewalks. We practice so much and need to stay so focused that it has a calming effect on me. I do a kind of visualization and meditation in the airlock prior to going outside, to guide my first activities once I get out in space. "

John M. Grunsfeld

" I believe that the future of humans, and the future of Earth, depends on space exploration. That's not a French problem, or a problem for Alabama: it's a planet-wide problem. International cooperation is crucial. "

John M. Grunsfeld

" The only reason Hubble works is because we have a space shuttle. "

John M. Grunsfeld

" Here we were, the only seven humans in space, repairing a telescope whose only purpose is to enrich the minds of people on planet Earth and increase our understanding of the workings of the universe. I can think of no better peaceful use of space for all humankind. "

John M. Grunsfeld

" Are we alone? Many, many people on planet Earth want to know. We are on the cusp of being able to answer that question... because of the investments we're making in space technology. "

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

" 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

" Our journey in going beyond our home planet is a human endeavor, and in the greatest tradition of exploration, past, present, and future spacefarers will continue to be enduring catalysts for inspiration in our quest to unravel the mysteries of the universe. "

John M. Grunsfeld

" There's no question that if we stay on planet Earth and never leave, that eventually we'll be wiped out. "

John M. Grunsfeld

" Only by studying large numbers of people can we figure out, are astronauts dying at a higher rate of cancer, and what types of cancers, than other people? "

John M. Grunsfeld

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

John M. Grunsfeld

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

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

" What we do at NASA is inspiring. It's reaching, it's visionary, and it inspires people on Earth to try hard things. "

John M. Grunsfeld

" I got lucky and got assigned to Hubble. "

John M. Grunsfeld

" Sciences are being unified by the search for life in 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

" We need to move off the planet. And Mars is the next best place. "

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

" The '60s were a remarkable time because several things were happening at once. Men were leaving planet Earth, kids were breaking into the television age, and I was able to see Neil Armstrong walking on the moon. "

John M. Grunsfeld

" As soon as I could ride a bike... I was always riding over to the Museum of Science and Industry to explore. It's where I first began to develop a fascination with machines and scientific principles. "

John M. Grunsfeld

" When I grew up on the south side of Chicago, it was kind of a rough neighborhood, and when my parents saw the prospect of my older sister going to middle school, high school, they decided that we would move to the north side of Chicago, Highland Park, and for me, that was a whole new ballgame. "

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

" I think it's really a sign of great American strength that we do invest the money we do in technology, in these hard projects, in NASA. "

John M. Grunsfeld

" There's a perspective that I've gained as an astronaut that I didn't get from my science activities. In my science activities, I learned by the seat of my pants. Spending 17 years as an astronaut, I learned the NASA formalism of systems engineering as if my life depended on it. Literally. "

John M. Grunsfeld