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" 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

Sister

High School

School

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" Going to Mars would make NASA great again. "

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

" 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

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

" 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. "

" 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. "

" 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. "

" 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. "

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

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

" I got lucky and got assigned to Hubble. "

" The strangest thing I've found is that when I got to space, I felt more comfortable in space that I've ever been on Earth before. I just felt this is my home. "

John M. Grunsfeld

Comfortable

Home

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

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

" 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. "

" I grew up on the south side of Chicago in the 1960s, and I think there was a synchronicity of events that inspired me to be an astronaut, and, of course, the backdrop is nothing less than Mercury, Gemini, and Apollo. That was a time in our nation where we aspired to great things, and we achieved them. "

John M. Grunsfeld

Chicago

Nothing

" All indications are that three and a half billion years ago, Mars looked like Earth. It had lakes. It had rivers. It had river deltas. It had snow-capped peaks and puffy clouds and blue sky. Three and a half billion years ago, it was a happening place. The same time on Earth, that's when life started. So did life start on Mars? "

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

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

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

" 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. "

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

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

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

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

" 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. "

" I think it's really a sign of great American strength that we do invest the money we do in technology, in these hard projects, in NASA. "

" 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. "

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

John M. Grunsfeld

Planet

Workout

" There's no question that if we stay on planet Earth and never leave, that eventually we'll be wiped out. "