Because of Hubble and other telescopes, we've now discovered that there are probably planets around every star, or virtually every star. There are solar systems around most stars. And the fact that we're here on a planet, Earth, means that… — John M. Grunsfeld Copy Share Image
Small bodies in our solar system, like comets and asteroids, help us understand how the solar system formed and provide opportunities to advance exploration. — 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
