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" Mars was this water-based planet, and we know there was stable water on the surface for a long time, which is critical for life having a chance to develop. "

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" 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. "

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

" 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. "

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

" 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. "

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

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

" 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. "

" 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. "

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

" 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.' "

" 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. "

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

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

" 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. "

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

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

" 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. "

" 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. "

" 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.' "

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

" Every time I give a talk, I ask the audience - especially if it's kids - how many want to go to Mars. At least half raise their hands. I don't think there's going to be any shortage of volunteers. "

" 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?' "

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

" 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. "

" 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. "

" 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. "