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

John M. Grunsfeld

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

John M. Grunsfeld

" I got lucky and got assigned to Hubble. "

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

" 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

" 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 moon's a nice place to visit, but you wouldn't want to live there. "

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 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 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

" 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

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

John M. Grunsfeld

" Regardless of what dreams you have, work very hard, play very hard, and have fun. "

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

" 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

" 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

" 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

" 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

" 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

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

John M. Grunsfeld

" The first thing to know about space food - it is the ambiance; it is the environment. It is not the food. "

John M. Grunsfeld

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

John M. Grunsfeld

" Going to Mars would make NASA great again. "

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

" 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

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

John M. Grunsfeld

" When I first went to Hubble, as an astronomer and as a scientist, it was a dream come true. And as an astronaut, the Hubble missions are premiere missions because Hubble is so important to science, so important to humanity, that it's just a very special event. But as an astronomer, it was sort of the holy grail of missions. "

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

" 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

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

John M. Grunsfeld

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

John M. Grunsfeld