meetings at the near encounters, the science was so wonderful that's what they wanted to talk about, the jpl. not about cal tech -- at cal tech, not about the damage, what the -- but the pictures were there horrendous scars and craters by every solid object those spacecraft pass. >> host: it's such a universal process. there are some -- obviously if you have a very thick atmosphere, that keeps craters from being formed, and there are some places that are just volcano world. that's the minority. mose places are getting pelted by these objects all the time. all these objects all the time, and in fact it's an amazing tool because things get hit at a certain rate and once we figured out what the rate was by measuring the ages of features on the moon, from the apollo program, you could extend that to all the other objects that were being pelted. so this is sort of like -- hugh do you look at the surface of a planet and tell how old it is? this is kind of how. without going down and picking up a sample and dating the rock, you can just look at it and it's a wonderful tool. so, yeah, you've got you

got the best women and men in the country together working with her team at jpl.we put together a mars exploration program driven by science with a strategy that said, first do the reconnaissance. where do you go? it's a big player. 150 million square kilometers. can't go everywhere. let's understand where the action is from orbit, let's land where the action is and move around as if we were there. sort of apollo without the astronauts with recently smart robots, and then eventually get to a point where we could do in situ analysis and return stuff for mars to earth. while we were doing this we realize there were meteorites delivered to us from mars. rather favorably by mother nature. we could also study and put that together to understand the planet and we have been in markedly successful. since the orbiters known as odyssey and in the mars reconnaissance orbiter through to rovers like spirit and opportunity, landis like phoenix and currently curiosity and, of course, moving on, we have really rewritten the textbooks. the kids of 2000, those young millennials sta

the best women and men in the country together working with n our team at jpl. put together a mars exploration program driven by science with a strategy that said, well, first we'll do the reconnaissance. where do you go? tg it's a big planet. 150 million square kilometers. you can't go everywhere.e so, let's understand where the action is from orbit.und let's land where the action is and move around as if we were there. sort of apollo without the astronauts with reasonably smare robots and then eventually get t to a point where we can do analysis and return stuff from mars to earth.an fro by the way, while we were doingn this we realized that there are meteorites delivered to us from mars rather favorably by mother nature.tem we can also study and put that together to understand the planet and we have been bee remarkably successful.e since the orbiters known as odyssey and through two rovers like spirit and opportunity, landers like phoenix and currently curiosity and moving on to maven, which is on the way, we have really rewritten the textbooks.kids of the ki

the best women and men in the country together working with our team at jpl. first, we'll do the reconnaissance. where do you go? it's a big planet. 150 mile square kilometers, you can't go everywhere. let's understand where the action is from orbit. let's land where the actions is and move around as if we were there. sort of apollo without the astronauts with reasonably smart robots and then eventually get to a point where we can do analysis and return stuff from mars to earth. by the way, while we were doing this we realized that there are meteorites delivered to us from mars rather favorably by mother nature. we can also study and put that together to understand the planet and we have been remarkably successful. since the orbitors known as odyssey and through two rovers like spirit and opportunities landers like phoenix and currently curiosity and of course moving on to maven which is on the way, we have rewritten the textbooks. the kids of 2,000, the young mill len yal stemmers would see a new mars in their textbooks 2014. things we didn't know about the m

the best women and men in the country together working with our team at jpl.first, we'll do the reconnaissance. where do you go? it's a big planet. 150 mile square kilometers, you can't go everywhere. let's understand where the action is from orbit. let's land where the actions is and move around as if we were there. sort of apollo without the astronauts with reasonably smart robots and then eventually get to a point where we can do analysis and return stuff from mars to earth. by the way, while we were doing this we realized that there are meteorites delivered to us from mars rather favorably by mother nature. we can also study and put that together to understand the planet and we have been remarkably successful. since the orbitors known as odyssey and through two rovers like spirit and opportunities landers like phoenix and currently curiosity and of course moving on to maven which is on the way, we have rewritten the textbooks. the kids of 2,000, the young mill len yal stemmers would see a new mars in their textbooks 2014. things we didn't know about the ma

the best women and men in the country together working with our team at jpl. first, we'll do the reconnaissance. where do you go? it's a big planet. 150 mile square kilometers, you can't go everywhere. let's understand where the action is from orbit. let's land where the actions is and move around as if we were there. sort of apollo without the astronauts with reasonably smart robots and then eventually get to a point where we can do analysis and return stuff from mars to earth. by the way, while we were doing this we realized that there are meteorites delivered to us from mars rather favorably by mother nature. we can also study and put that together to understand the planet and we have been remarkably successful. since the orbitors known as odyssey and through two rovers like spirit and opportunities landers like phoenix and currently curiosity and of course moving on to maven which is on the way, we have rewritten the textbooks. the kids of 2,000, the young mill len yal stemmers would see a new mars in their textbooks 2014. things we didn't know about the m