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" 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. "

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" Being able to have a laboratory on Mars, being able to have some sort of sustained human presence on Mars in the future, I think, is critically important for science. "

Ellen Stofan

Future

Think

Science

" I grew up in this business... A lot of my life has been centered around this question about how NASA is helping us to understand our own home planet... and to understand our place in the universe. "

" As a card-carrying space nerd and NASA's chief scientist, I love space movies, from 'Star Trek' to 'Star Wars' to my all-time favorite - 'The Dish', an Australian comedy that celebrates that first moment when Neil Armstrong stepped down onto the surface of our moon. "

" We like to talk about pioneering Mars rather than just exploring Mars, because once we get to Mars, we will set up some sort of permanent presence. "

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

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

" 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?' "

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

" 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. "

" So many people I talk to who work in technology, you ask them, 'What got you interested in science?' and those from my generation say, 'The Apollo landings.' "

" 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. "

" 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. "

" You see countries like India really investing in their space program because they see it as inspirational and good for their economy. "

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

Ellen Stofan

Space

People

" 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. "

" 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. "

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

" 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. "

" 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? "

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

" 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. "

" 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

" We want to make sure we get living astronauts to the surface of Mars. "

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

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

" A lot of my role is advocacy, and as a scientist, you're an advocate, too, because you are coming up with a theory and having to convince your fellow scientists that you're right. "

" 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. "

" I wish someone would redo 'Dune.' "

" When we go to explore, we do it as a globe. "

Ellen Stofan

Explore

Globe

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