Sir Richard Branson might want to look over his shoulder, since Virgin Galactic now has an even more ambitious rival. Britain-based Excalibur Almaz is planning no less than a trip to the Moon using reworked, Soviet-era Salyut space stations and Soyuz capsules as the vehicles for the multi-stage, 500,000-mile total voyage. Accordingly, no one will be living in the lap of luxury on the way there: there's just two habitation modules that will take three people each, and the six-month trip is
