If the Russians plan to try clandestine nuclear tests deep in space, they now have less chance than ever of getting away with it. Last week the U.S. orbited two vigilant satellites loaded with sensitive instruments capable of measuring X rays, gamma rays and neutrons from any source and any direction. Taking positions 65,000 miles up and on opposite sides of the earth, they joined a similar pair that was launched last October and has been performing far better than its builders had hoped.
The Department of Defense, which ordered the satellites from Space Technology Laboratories, and the Atomic Energy...
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