OK, so it's only for snapshots and objects no larger than a golf ball, but Las Vegas real-estate developer Robert Bigelow is taking reservations for the first space-travel program for the masses. Late next month, Bigelow plans to launch a 15-foot inflatable spacecraft from Russia on a converted intercontinental ballistic missile. A sort of flying attic, the craft will carry more than 4,000 photographs, 500 objets d'art and other mementos contributed by members of the public.