I kind of feel like I found my cause in life servicing the Hubble Space Telescope. — 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
Sciences are being unified by the search for life in the universe. — 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
We're being very careful that we don't send a spacecraft to Mars with the intention of detecting Martian life - and find… — John M. Grunsfeld Copy Share Image
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 Copy Share Image
There's a perspective that I've gained as an astronaut that I didn't get from my science activities. In my science activities, I… — John M. Grunsfeld Copy Share Image
To help enable the kind of science Hubble is performing makes my life worthwhile. — John M. Grunsfeld Copy Share Image
Life outside of Earth is probably going to be really hard to find. — John M. Grunsfeld Copy Share Image
A deep ocean under the icy crust of Ganymede opens up further exciting possibilities for life beyond Earth. — John M. Grunsfeld Copy Share Image
All space exploration is risky. As an astronaut, I had to decide each and every time I went to space whether or… — John M. Grunsfeld Copy Share Image
Once we get beyond Mars, which formed from the same stuff as Earth, the likelihood that life is similar to what we… — John M. Grunsfeld Copy Share Image
We don't know how many planets we're going to have to examine before we find life, and not finding it on 10… — John M. Grunsfeld Copy Share Image
A lot of people get home from work and sink into a good chair, the place in their life where they feel… — John M. Grunsfeld Copy Share Image
All indications are that three and a half billion years ago, Mars looked like Earth. It had lakes. It had rivers. It… — 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
