sir richard brananson's virirg galactic intends s to fly customerss on suborbitalal flil nenext year. 60600 people prepaid up to $250,000 apiece for a future sat. >> people w want to go t to spa shouldld go to space, because ty come back changed. >> reporter: they go up a tourist, come down a an astron. >> this isis where you getet strapppped in. >> repororter: b billionairere isisaacman charterered a spacex spspaceship f for a three-daday ofof earth called "inspiration " a crew of four will fly higher than the space station. they're all civilians. >> this is a first. making significance, that's responsibility. >> responsibility being the first, that there will be a second and a third and a fourth? >> absolutely. you have to get this one right for all the other great missions to follow. >> reporter: there are special packages available to the international space station, even a planned orbit around the moon. but lots of unanswered questions. is the space tourism market sustainable? what about risk? and access? today's ticket prices defy gravity. and most people's budgets. >> i certain