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 Island Group Space Island Group Space Island Group (SIG) is a commercial organization based in West Covina, CA that is dedicated to the development of commerce, research, manufacturing and tourism in space. They plan to accomplish this by designing, building and operating commercial space transportation systems and destinations. Their flagship project is the Space Island Project. They plan to accomplish this through the use of technologies, vehicles and procedures developed by NASA and aerospace companies over the last 25 years. The Space Island Project is a project whose goal is to create a stand-alone commercial space infrastructure supporting manned business activities in