Because of Hubble and other telescopes, we've now discovered that there are probably planets around every star, or virtually every star. There… — John M. Grunsfeld Copy Share Image
Are we alone? Many, many people on planet Earth want to know. We are on the cusp of being able to answer… — John M. Grunsfeld Copy Share Image
Here we were, the only seven humans in space, repairing a telescope whose only purpose is to enrich the minds of people… — John M. Grunsfeld Copy Share Image
The '60s were a remarkable time because several things were happening at once. Men were leaving planet Earth, kids were breaking into… — John M. Grunsfeld Copy Share Image
The truth is, every single rocket launch off of planet Earth is risky. — John M. Grunsfeld Copy Share Image
After my spacewalks, I am quite exhilarated but also tired, similar to a workout on Planet Earth. — John M. Grunsfeld Copy Share Image
There's no question that if we stay on planet Earth and never leave, that eventually we'll be wiped out. — John M. Grunsfeld Copy Share Image
Absolutely the most fun thing to do in space and rewarding thing, in many ways, is to look back at planet Earth. — John M. Grunsfeld Copy Share Image
I'm absolutely compelled for NASA to send international astronauts to Mars to find out if Mars ever harbored life. — John M. Grunsfeld Copy Share Image
Sciences are being unified by the search for life in the universe. — John M. Grunsfeld Copy Share Image
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… — John M. Grunsfeld Copy Share Image
At the age of six, I declared that I wanted to be an astronaut. My mother thought that was just fine, as it would… — John M. Grunsfeld Copy Share Image
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 Copy Share Image
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. — John M. Grunsfeld Copy Share Image
I see no difference between scientific exploration and human exploration. — John M. Grunsfeld Copy Share Image
Being an astronaut, there are not a lot of things that have really shocked me in my life. — John M. Grunsfeld Copy Share Image
I kind of feel like I found my cause in life servicing the Hubble Space Telescope. — John M. Grunsfeld Copy Share Image
