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

John M. Grunsfeld

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" I got lucky and got assigned to Hubble. "

John M. Grunsfeld

" 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? "

John M. Grunsfeld

" Life outside of Earth is probably going to be really hard to find. "

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

" 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

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

John M. Grunsfeld

" 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

" 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. "

John M. Grunsfeld

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

John M. Grunsfeld

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

John M. Grunsfeld

" Going to Mars would make NASA great again. "

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

" 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

" 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

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

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

" 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

" 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. "

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

" 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

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

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 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

" 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

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

John M. Grunsfeld

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

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

" 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 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

" 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