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Then something happened to Cosmos. It may have sprung a small leak ; perhaps it struck a tiny asteroid (小行星) or a piece of debris. Nobody knows for sure, but for one reason or another. Cosmos drifted off course. T. S. Kelso, an aeronautics expert at Analytical Graphics. which provides satellite-tracking services to NASA, noticed that the orbits of Cosmos and Iridium were bringing the two satellites closer to each other all the time. In February he issued a waming that they would pass within a kilometer of one another. He was right. On Feb. 10, Motorola lost track of Iridium’s signal. Over the next few days, Kelso and others surmised (推测) that what many had feared for years had finally come to pass: two intact (完好无损的) satellites had collided head on. What had happened to Cosmos and Iridium in February according to Kelso
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