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" The things I like to do involve a lot of mental focus, a combination of physical and mental challenge. That is what mountain climbing is. "

John M. Grunsfeld

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" Going to Mars would make NASA great again. "

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

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

John M. Grunsfeld

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

John M. Grunsfeld

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

John M. Grunsfeld

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

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

" I got lucky and got assigned to Hubble. "

John M. Grunsfeld

" Are we alone? Many, many people on planet Earth want to know. We are on the cusp of being able to answer that question... because of the investments we're making in space technology. "

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

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

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

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

John M. Grunsfeld

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

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

" 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

" 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

" 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

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

John M. Grunsfeld

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

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

" 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

" 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

" Small bodies in our solar system, like comets and asteroids, help us understand how the solar system formed and provide opportunities to advance exploration. "

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 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

" 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

" 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

" 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

" 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