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liquid water ice there. understanding the radiation environment. the dust environment. a whole host of things is what leads nasa to this moment, rosemary. >> and miles, after the first historic moon landing in 1969, why after all these years are we suddenly seeing a renewed international space race to the moon? >> it's interesting. a lot of theories about that. a lot of people. because of the unique nature of that moon race and the amount of money spent in that time frame. in the midst of the cold war, honoring the wishes of a martyred president. et cetera. we sort of inserted a piece of 21st century technology in the 20th century. and so we were way ahead of our time then and more prepared to stay there budgetarily and otherwise. and so, we spend some time on the space shuttle. built the international space station. and now, the push is to eventually go to mars. and the thing i think is pretty