If you've got more than the standard $20 million for a trip into space, you could take a spacewalk. A Virginia-based company is not only offering trips to the International Space Station, but is also offering spacewalks.

Space Adventures has announced that future space travelers will have the opportunity to take a 90-minute spacewalk, or an extravehicular activity and extend their trip by up to eight days. But the extra is going to cost an additional $15 million.

NASA officials say they haven't been notified that anyone would be selling spacewalking opportunities.

Spacewalkers would be accompanied by a cosmonaut and would at all times be tied to the space station. So far, three people have made paid trips to the station with another man set to become the fourth in September.