Because of the healt hazards of solar activity, human traffic in deep space will require facilities for monitoring, predicting, and altering the astronauts to potential danger. This suggests a ‘‘solar watch’’ program consisting of a network of platforms at one A.U. from the Sun, capable of monitoring its global behavior. The instrumentation carried by these network platforms can evolve in sophistication with successive launches, in order to lead to a deep understanding of the physical mechanisms of solar activity — the best basis for maximally reliable activity forecasts. The possibility of steroscopic viewing of the solar surface and corona will confer unique advantages for the physical understanding of these physical mechanisms.