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" 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

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

John M. Grunsfeld

" A lot of people get home from work and sink into a good chair, the place in their life where they feel most comfortable. I get that comfort in space, the place where I most feel like I belong. "

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

" Life outside of Earth is probably going to be really hard to find. "

John M. Grunsfeld

" I see no difference between scientific exploration and human exploration. "

John M. Grunsfeld

" I think that space exploration as a broad activity is the most important things that humans can do. I've always found it fascinating, interesting, compelling, and I have a drive to go out into space. "

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

" Small bodies in our solar system, like comets and asteroids, help us understand how the solar system formed and provide opportunities to advance exploration. "

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

" 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

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

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

" 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

" I'm absolutely compelled for NASA to send international astronauts to Mars to find out if Mars ever harbored life. "

John M. Grunsfeld

" Hubble isn't just a satellite; it's about humanity's quest for knowledge. "

John M. Grunsfeld

" I got lucky and got assigned to Hubble. "

John M. Grunsfeld

" Here on Earth, we're exposed to asteroids hitting the Earth, eventual changes in the Sun, changes in the Earth's climate, things we're doing to the Earth's climate. If we want to survive, we need to become a multi-planet species. That's further down the road, but the first wave is going to be the explorers. "

John M. Grunsfeld

" It's pretty amazing to me that we have had a space shuttle program that's lasted for 30 years - for one space shuttle. That's quite an achievement. "

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

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

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

" Hubble showed us the marvel and majesty of stars being born. "

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

" InSight will get to the 'core' of the nature of the interior and structure of Mars, well below the observations we've been able to make from orbit or the surface. "

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

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

John M. Grunsfeld

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

John M. Grunsfeld

" Growing up in Highland Park, in high school, I had some very influential teachers: I had a math teacher who taught calculus that helped me learn to be in love with mathematics; I had a chemistry teacher who inspired us to work what was in the class and to go beyond. "

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

" 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