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

John M. Grunsfeld

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" 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

" 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 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

" 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

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

John M. Grunsfeld

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

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

" 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

" 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

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

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

" 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

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

John M. Grunsfeld

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

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

" 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

" 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

" 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

" There is no stronger case for the motivational power of real science than the discoveries that come from the Hubble Space Telescope as it unravels 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

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

John M. Grunsfeld

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

John M. Grunsfeld

" Going to Mars would make NASA great again. "

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

" 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

" The truth is, every single rocket launch off of planet Earth is risky. "

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

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

John M. Grunsfeld