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" 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. "

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" The most striking thing to me about human space flight and my own personal experience is that I've seen dramatic changes on Earth. We humans are rapidly changing the planet. I've watched Amazonia as the rainforest has been cut down. That's something I've seen out the window. I'm very worried about that. "

John M. Grunsfeld

Window

Space

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

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

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

John M. Grunsfeld

Sciences

Universe

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

" I thrive with high-performance challenges in front of me. "

" I have had the privilege to be a member of many high-performance teams at NASA, both on and off the planet. "

" A lot of people get home from work and sink into a good chair, the place in their life where they feel most comfortable. I get that comfort in space, the place where I most feel like I belong. "

" One of the things that happens in space is that there is a fluid shift. You get a lot of extra pressure, and it fills your sinuses, and the horseradish is a miracle worker for cleaning that out. "

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

" 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. "

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

" 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

" 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

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

" 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. "

" Going to Mars would make NASA great again. "

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

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

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

John M. Grunsfeld

Space

Kind

" 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. "

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

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

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

" 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. "

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

" 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. "

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

" 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. "

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