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.

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

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

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

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

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

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.

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.

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.

We don't know how many planets we're going to have to examine before we find life, and not finding it on 10 or 100 doesn't mean it's not there. This may be very tricky.

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

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.

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

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.

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

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.

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

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

I see no difference between scientific exploration and human exploration.

Going to Mars would make NASA great again.

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

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.

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

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