We need to move off the planet. And Mars is the next best place. — 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
InSight will get to the 'core' of the nature of the interior and structure of Mars, well below the observations we've been… — 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
The surface of Mars is bathed in ultraviolet light, bathed in radiation. Mars's magnetic field is essentially gone, so the surface of… — 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
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'm absolutely compelled for NASA to send international astronauts to Mars to find out if Mars ever harbored life. — John M. Grunsfeld Copy Share
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
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
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
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
I see no difference between scientific exploration and human exploration. — John M. Grunsfeld Copy Share
Being an astronaut, there are not a lot of things that have really shocked me in my life. — John M. Grunsfeld Copy Share
I kind of feel like I found my cause in life servicing the Hubble Space Telescope. — John M. Grunsfeld Copy Share
One of the things that happens in space is that there is a fluid shift. You get a lot of extra pressure, and it… — John M. Grunsfeld Copy Share
The things I like to do involve a lot of mental focus, a combination of physical and mental challenge. That is what mountain climbing… — John M. Grunsfeld Copy Share
