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

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" 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.' "

" 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. "

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

" 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. "

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

" 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? "

" 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?' "

" 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. "

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

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

" 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. "

" 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.' "

" 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. "

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

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

" 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. "

" 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. "

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

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

" 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. "

" 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. "

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

" 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. "

" 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. "

" I wish someone would redo 'Dune.' "

" 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. "

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

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