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" After my spacewalks, I am quite exhilarated but also tired, similar to a workout on Planet Earth. "

John M. Grunsfeld

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

John M. Grunsfeld

" Going to Mars would make NASA great again. "

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 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

" 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

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

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

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

John M. Grunsfeld

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

John M. Grunsfeld

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

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

" 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

" 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

" Sciences are being unified by the search for life in the universe. "

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

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

John M. Grunsfeld

" The best would be to fly in space with family and friends. "

John M. Grunsfeld

" The team at the Space Telescope Science Institute has a demonstrated record of meeting the high-performance challenges of operating the Hubble Space Telescope and preparing for the James Webb Space Telescope. "

John M. Grunsfeld

" I got lucky and got assigned to Hubble. "

John M. Grunsfeld

" The biggest honor is to be an astronaut. It's such a tremendous privilege to be able to represent humankind in our quest to explore space. "

John M. Grunsfeld

" The Martian atmosphere is very thin. It's like our atmosphere at 100,000 feet. "

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

" 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

" One of the things that happens in space is that there is a fluid shift. You get a lot of extra pressure, and it fills your sinuses, and the horseradish is a miracle worker for cleaning that out. "

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

" 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

" When people left on the Oregon Trail from St. Louis, they knew that only a fraction of them would make it to the West Coast. But they went anyway. "

John M. Grunsfeld

" The James Webb Space Telescope was specifically designed to see the first stars and galaxies that were formed in the universe. So we're gonna see the snapshot of when stars started. When galaxies started. The very first moments of the universe. And my bet? There's gonna be some big surprises. "

John M. Grunsfeld