Only by studying large numbers of people can we figure out, are astronauts dying at a higher rate of cancer, and what types of cancers, than other people? — 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
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 Image
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 Image
Once in a while, the universe lets you be free alone and in peace. — John M. Grunsfeld Copy Share Image
