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" 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. "

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" Science fiction has been an inspiration to generations of scientists and engineers, and the film series 'Star Wars' is no exception. "

John M. Grunsfeld

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" 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

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" 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. "

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

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

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

" 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

Small

Investment

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

" 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. "

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

" 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

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Intention

" 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. "

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

" 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. "

" 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. "

" 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. "

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

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

" 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? "

" As a young boy growing up on the South Side of Chicago, I was inspired by the nascent space age. "

" 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. "

" I got lucky and got assigned to Hubble. "

" I kind of feel like I found my cause in life servicing the Hubble Space Telescope. "

John M. Grunsfeld

Space

Kind

" If I could live in space, I would definitely do that. "

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

John M. Grunsfeld

Sciences

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" 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. "

" I have had the privilege to be a member of many high-performance teams at NASA, both on and off the planet. "

" 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. "

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

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