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" 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. "

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" 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

Star

Now

Solar

" 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. "

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

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

" 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

Space

Questions

" 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? "

" I can't imagine anywhere I'd rather be than outside the space shuttle in my space suit next to the Hubble Space Telescope. "

John M. Grunsfeld

Suit

Outside

" 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. "

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

" 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. "

" 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. "

" Asteroid detection, tracking, and defense of our planet is something that NASA, its interagency partners, and the global community take very seriously. "

" 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. "

" The James Webb Space Telescope was specifically designed to see the first stars and galaxies that were formed in the universe. So we're gonna see the snapshot of when stars started. When galaxies started. The very first moments of the universe. And my bet? There's gonna be some big surprises. "

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

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

John M. Grunsfeld

Sciences

Universe

" At the age of six, I declared that I wanted to be an astronaut. My mother thought that was just fine, as it would encourage me to learn science, and besides, there really was no chance I would ever actually become an astronaut. "

" I look forward to working with the NASA team to help enable new discoveries in our quest to understand our home planet and unravel the mysteries of the universe. "

" 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. "

" 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. "

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

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

John M. Grunsfeld

Planet

Workout

" I have dedicated my life to answering the great scientific questions of our time and to the incredible adventure of space exploration. "

" 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. "

" 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. "

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

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

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

" 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

Mental

Challenge