is expensive. >> you know you heard this before, we have so many problem on this planet, why do we check out other planets? what do you say to that? >> you have to explore. we as a human species have a burning, yearning desire to find out what is going on, it is importance, i think, this is my opinion. i think a lot share, a desire to find out what is out there, ha is on mars, what is it made of, what happened billions of years ago, only way we can do that is go there research and find out the story. brian: i know they talk about trying to get water out of the moon, there are certain things to benefit, and an important element is amount of risk, you don't have to convince someone there are risks. when something like that happens, and knowing that those ships were made here, what was it like.