I got lucky and got assigned to Hubble.

Going to Mars would make NASA great again.

If I could live in space, I would definitely do that.

There are some things worthy of risking your life for.

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

The best would be to fly in space with family and friends.

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

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

Getting a team of scientists on Mars could be transformative.

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

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

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

Once in a while, the universe lets you be free alone and in peace.

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

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

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

I see no difference between scientific exploration and human exploration.

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

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

Regardless of what dreams you have, work very hard, play very hard, and have fun.

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

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

Being an astronaut, there are not a lot of things that have really shocked me in my life.

As a young boy growing up on the South Side of Chicago, I was inspired by the nascent space age.

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

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

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

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

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

Absolutely the most fun thing to do in space and rewarding thing, in many ways, is to look back at planet Earth.

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

What we do at NASA is inspiring. It's reaching, it's visionary, and it inspires people on Earth to try hard things.

Sometimes astronauts feel a little ill or get minor scrapes. I trained as a crew medical officer to do basic treatment.

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

The James Webb Space Telescope was specifically designed to see the first stars and galaxies that were formed in the universe.

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.

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

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

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.

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.

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.

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.

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.

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.

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.

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.

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

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?

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

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.

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