possibilities could be that we could go out beyond mars. right now the practical applications would be to try to return to the moon and go on to mars. i think what you'll here more than anything else is sending astronauts to mars. somewhere in there we will have to return to the moon, that will come about 2020. there is also some speculation about possibly visiting an astroid and that could be pretty exciting. going on beyond that is questionable. we have to figure out what are locations where we can get to relatively easily, safe low and will be scientifically beneficial to send humans out to beyond the risk there would be for going that far. heather: the final flight of the space shuttle marked the end of an era and it was sad for a lot of folks to see that happen. while the shuttle is retiring, nass ace not, right? >> the space shutter program marked a dramatic change in what