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

John M. Grunsfeld

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" 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

" 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

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

John M. Grunsfeld

" I don't particularly want to jump out of an airplane with a parachute if I don't have to. I don't want to go bungee jumping. I like adventure with a real purpose that I can buy into. "

John M. Grunsfeld

" The biggest honor is to be an astronaut. It's such a tremendous privilege to be able to represent humankind in our quest to explore space. "

John M. Grunsfeld

" 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

" 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. "

John M. Grunsfeld

" 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

" 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. "

John M. Grunsfeld

" 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

" I got lucky and got assigned to Hubble. "

John M. Grunsfeld

" The first thing to know about space food - it is the ambiance; it is the environment. It is not the food. "

John M. Grunsfeld

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

John M. Grunsfeld

" 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. "

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

" 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

" 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

" 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. "

John M. Grunsfeld

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

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

" 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

" 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

" 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

" 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

" To help enable the kind of science Hubble is performing makes my life worthwhile. "

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

" 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

" 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