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" A deep ocean under the icy crust of Ganymede opens up further exciting possibilities for life beyond Earth. "
John M. Grunsfeld
Life
Ocean
Possibilities
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" Regardless of what dreams you have, work very hard, play very hard, and have fun. "
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" 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
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" I see no difference between scientific exploration and human exploration. "
John M. Grunsfeld
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" The first thing to know about space food - it is the ambiance; it is the environment. It is not the food. "
John M. Grunsfeld
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" Sciences are being unified by the search for life in the universe. "
John M. Grunsfeld
Sciences
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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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" 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
Radiation
Gone
Light
" When I grew up as a kid, we didn't know there were any other planets outside of our own solar system. It was widely speculated that planet formation was an incredibly rare event and that it's possible that other planets just don't exist in our galaxy, and it's just this special situation where we happen to have planets around our sun. "
John M. Grunsfeld
Situation
Know
Sun
" 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
Doing
Sun
Need
" To help enable the kind of science Hubble is performing makes my life worthwhile. "
John M. Grunsfeld
My Life
Life
Kind
" 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
Technology
Money
Hard
" 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
Me
Nothing
" 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
Earth
Believe
Future
" The Martian atmosphere is very thin. It's like our atmosphere at 100,000 feet. "
John M. Grunsfeld
Atmosphere
Our
Feet
" Being an astronaut, there are not a lot of things that have really shocked me in my life. "
John M. Grunsfeld
Life
Things
Really
" I was not really scared on my spacewalks. We practice so much and need to stay so focused that it has a calming effect on me. I do a kind of visualization and meditation in the airlock prior to going outside, to guide my first activities once I get out in space. "
John M. Grunsfeld
Me
Meditation
Need
" As a young boy growing up on the South Side of Chicago, I was inspired by the nascent space age. "
John M. Grunsfeld
Growing Up
Growing
Chicago
" 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. "
John M. Grunsfeld
Ride
Bike
Museum
" 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
People
Studying
Dying
" I thrive with high-performance challenges in front of me. "
John M. Grunsfeld
Front
Challenges
Thrive
" All space exploration is risky. As an astronaut, I had to decide each and every time I went to space whether or not to risk my life for the mission. "
John M. Grunsfeld
Time
Life
Mission
" 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
More
Space
Questions
" The truth is, every single rocket launch off of planet Earth is risky. "
John M. Grunsfeld
Launch
Earth
Rocket
" 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
Space
Pretty
Me
" 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
Space
Hubble
Challenges
" There's no question that if we stay on planet Earth and never leave, that eventually we'll be wiped out. "
John M. Grunsfeld
Earth
Leave
Never
" 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
Earth
Beyond
Find
" 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
Space
Time
Life
" Life outside of Earth is probably going to be really hard to find. "
John M. Grunsfeld
Find
Earth
Going
" 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
Look
Out
Planet