Never be limited by other people's limited imaginations.

Some of the most fun people I know are scientists.

Don't let anyone rob you of your imagination, your creativity, or your curiosity. It's your place in the world; it's your life. Go on and do all you can with it, and make it the life you want to live.

Never limit yourself because of others' limited imagination; never limit others because of your own limited imagination.

Once I got into space, I was feeling very comfortable in the universe. I felt like I had a right to be anywhere in this universe, that I belonged here as much as any speck of stardust, any comet, any planet.

As an astronaut, you have a very defined set of tasks to do. Those tasks may require you to work 60, 70 or 80 hours a week.

You have the right to be involved. You have something important to contribute, and you have to take the risk to contribute it.