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" We have to ask, 'How can we break a huge challenge like sending humans to Mars into a series of doable, affordable steps? How can we break that problem down into chunks in order to keep making progress?' "

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" What we expect to find, certainly in our own solar system, are probably simple single or multiple-cell forms of life. To get to intelligent life takes stability of conditions over huge, long periods of time. "

Ellen Stofan

Simple

Time

Long

" As we visit Mars multiple times, we will build up infrastructure on the surface to expand the capabilities and reach of humans on Mars. "

" If I had an unlimited budget, I would really be probing that question of life because we know what the questions are, and we know what the destinations are. "

" With the mission to Mars, the whole world wants to get involved. So we actually have 13 different space agencies from around the world working on the global exploration road map. "

" I always like to say just think you were a doctor with only one patient. You might understand how that person gets sick, how they get better, but you understand nothing about the progression of disease or how humans in general get ill. Now take an Earth scientist: you only have one planet to study. "

" Humans can actually read a landscape, go through a lot of rocks - crack them open, throw them, pick up the next one. Rovers are great - they do amazing science - but it is a lot more tedious process; they go much less far than a human can cover in a day. "

" 'The Martian' may be fiction, but at NASA, we are working to make it a reality. "

" People see space as a place where you go and cooperate. "

Ellen Stofan

Space

People

" To unambiguously settle the questions of whether there was life on Mars, it will take scientists down on the surface. "

" We're going to understand that there is life on other bodies in the solar system. "

" We're not going to get humans to Mars until at least the mid-2030s, and the world is going to change by then. "

" Everybody has busy lives, but you can tell people, 'Go outside and look at the night sky. We've been able to demonstrate that every star you see probably has a planet around it.' "

" Instead of being able to look at smaller interesting research projects, I am trying to see the links between all the research NASA does. For me, that's extremely fun because I get to go play and learn about areas of science that I know nothing about. "

" If you think of the Apollo capsule coming into Earth with a parachute, the Mars atmosphere is just so thin, you've got to find some way of slowing yourself down really rapidly. "

" We actually look to the scientific community to kind of come back to NASA and tell us what the priorities should be. And then at NASA, we try to look within our budget and say, 'What can we accommodate, and what are the most important things for the nation?' "

" There's a huge question of whether you really need water for life. "

" One of the big things about space exploration is that it is as expensive as it is complicated, and you need all the countries of the world to help if you want to accomplish big goals. "

" I'm so biased to this issue of the origins of life and the limits of life. "

" It's part of the human character to want to know what's over the next hill, to want to know what's beyond. "

" The public has an incredible capacity for appreciating the wonder of our planet, our solar system, our universe. "

" When you look at Venus and the Earth, they formed at about the same place in the solar system. They're made of about the same materials; they're about the same size. "

" Communication is an issue where we can improve, and if I can do anything to help, I am happy to. "

" My key aim is to get man on the surface of Mars by the mid-2030s. "

" I live an hour from NASA's HQ in Washington, D.C., and sitting in a jam stresses me out. "

Ellen Stofan

Washington

Sitting

" I'm actually a NASA brat. My father was a rocket scientist. He started working at NASA before it was NASA in 1959. "

" To avoid congestion, I get up at 5:10, grab a slice of raisin toast, and leave the house at 6 A.M. My husband, Tim Dunn, who works for an environmental agency, is still asleep when I slip out, and I find that rather annoying. "

Ellen Stofan

House

Husband

" Mars missions will require up to three years in reduced gravity, so we need to make sure astronauts can not only survive but thrive as they move outward to explore this new world. "

" Prior to Magellan, due to the fact that we knew it was so hot on Venus, we thought that the rocks at the surface would behave more plastically, more like Silly Putty than like solid rock in the way that we think of it, like the rocks that I'm sitting on. "

" As chief scientist, it's sort of my job to look at bridges between what we do and to see the connections. But when we try to understand how are planets around other stars habitable... to looking back at the Earth - how are the changes that are taking place, how are they going to affect humanity? "

" Water-based life is very much an Earth-centric view, and we can push the envelope on that here in our own solar system. We have the methane seas of Titan. "