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:
Business tourism Business tourism Business tourism or business travel is a more limited and focused subset of regular tourism. During business tourism (traveling), individuals are still working and being paid, but are doing so away from both their workplace and home. Some definitions of tourism exclude business travel. However, the World Tourism Organization (UNWTO) defines tourists as people "traveling to and staying in places outside their usual environment for not more than one consecutive year for leisure, business and other purposes". Primary business tourism activities include meetings, and attending conferences and exhibitions. Despite the term business in business tourism, when individuals from