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" 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
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" Here we were, the only seven humans in space, repairing a telescope whose only purpose is to enrich the minds of people on planet Earth and increase our understanding of the workings of the universe. I can think of no better peaceful use of space for all humankind. "
John M. Grunsfeld
Peaceful
Think
Space
" 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
" Life outside of Earth is probably going to be really hard to find. "
John M. Grunsfeld
Find
Earth
Going
" 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
Exploration
Help
Small
" 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
" 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
Work
Space
Home
" 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
" 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
Privilege
NASA
Many
" To help enable the kind of science Hubble is performing makes my life worthwhile. "
John M. Grunsfeld
My Life
Life
Kind
" The truth is, every single rocket launch off of planet Earth is risky. "
John M. Grunsfeld
Launch
Earth
Rocket
" Hubble has really opened our eyes to what the universe is made of, its structure, and has helped us learn how little we know about the universe. "
John M. Grunsfeld
Structure
Know
Eyes
" 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. "
John M. Grunsfeld
Mother
Chance
Age
" The only reason Hubble works is because we have a space shuttle. "
John M. Grunsfeld
Space
Reason
Only
" We're being very careful that we don't send a spacecraft to Mars with the intention of detecting Martian life - and find out that we detected the Earth life that we took with us. "
John M. Grunsfeld
Us
Find
Intention
" 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
Humanity
Science
Dream
" 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
You
Cleaning
Miracle
" 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
" The Hubble Space Telescope, which was designed for extreme servicing, you know, we can fix everything. And the James Webb Space Telescope, where we can fix nothing. It has to work the first time. And it's a very complicated telescope. "
John M. Grunsfeld
Time
Work
You
" There are some things worthy of risking your life for. "
John M. Grunsfeld
Things
Some
Your
" I see no difference between scientific exploration and human exploration. "
John M. Grunsfeld
Human
See
Exploration
" Science at NASA is all about exploring the endless frontier of the Earth and space. "
John M. Grunsfeld
Space
Earth
Exploring
" 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
Like
Mental
Challenge
" The Martian atmosphere is very thin. It's like our atmosphere at 100,000 feet. "
John M. Grunsfeld
Atmosphere
Our
Feet
" I kind of feel like I found my cause in life servicing the Hubble Space Telescope. "
John M. Grunsfeld
Like
Space
Kind
" Once in a while, the universe lets you be free alone and in peace. "
John M. Grunsfeld
Free
Peace
Alone
" 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
Only
West
Trail
" 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
" Hubble isn't just a satellite; it's about humanity's quest for knowledge. "
John M. Grunsfeld
Quest
About
Humanity
" 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
Me
Window
Space
" Sometimes astronauts feel a little ill or get minor scrapes. I trained as a crew medical officer to do basic treatment. "
John M. Grunsfeld
Astronauts
Medical
Feel