Space architecture of space and a space transportation infrastructure can be accelerated. Virgin Galactic has indicated plans for an orbital craft, SpaceShipThree. The demand for space tourism is one without bound. It is not difficult to imagine lunar parks or cruises by Venus. Another impetus to become a spacefaring species is planetary defense. The classic space mission is the Earth-colliding asteroid interception mission. Using nuclear detonations to split or deflect the asteroid is risky at best. Such a tactic could actually make the problem worse by increasing the amount of asteroid fragments that do end up hitting the Earth. Robert Zubrin writes:
Space Coast Office of Tourism had a strong focus on tourism through the space industry, and the industry accounted for as much as 15% of the tourism in the region, but with a reduction in shuttle launches this dropped to under 5% by 2005. Accordingly, the office had to move their focus to alternative tourism operations, selling "beaches, cruise ships and nature tourism", and after the Space Shuttle "Columbia" disaster in 2003, the Space Shuttle was dropped from their advertising campaigns. Although the "Discovery's" launch in 2005 did see a return of astronaut imagery, the region's dependency on the space industry was much reduced, and