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:
Virgin Megastores current music collection. This is designed to add to the services provided by Virgin, rather than replace the Megastores. The download service faced some criticism from consumer groups due to its incompatibility with the popular iPod music player. The service has since been discontinued. Around the world there were other Virgin branded digital music retail websites, such as VirginMega.fr, France's number 2 music download website. In 2003, the first and only Virgin Megastore in Vienna, Mariahilferstraße, was sold and closed. There were 35 Virgin Megastores in France. 12 additional stores in France were branded Furet du Nord, and about 10