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 were locked in at an extremely low rate. Both real estate companies wanted to break the leases and replace Virgin with new tenants that were willing to pay the then current highly inflated rental rates that would make an entertainment retail business unprofitable. They have since made the decision to close all of the American stores. Virgin shops have a wide selection of CDs, games, books, DVDs, vinyl records, magazines, portable media players, accessories and additional products such as calendars, board games and Virgin branded items. Larger stores also stock electronic equipment and computer peripherals. Note that not all of