RadianceBorn from the threat of nuclear weapons comes a program to build an impenetrable defense against them. The technical obstacles are enormous, the costs exorbitant, and the results dubious. Philip Quine didn't come to the Lab to work on weapons, but his expertise with X rays leads him to Superbright, in theory an orbital battle station to shoot down missiles, in reality little more than spotty test data. Superbright is only the beginning, as Quine is