The Search for Extra-Terrestrial Intelligence Institute (SETI), listening to the cosmos for signs of signals from alien civilizations, may be monitoring the wrong "channels," a U. S. astrophysicist says.
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Gregory Benford of the University of California, Irvine,
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says such a civilization wanting to announce its presence would transmit "cost-optimized" narrowly focused signals,
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not the continuous omni-directional signals the SETI program has been scanning for, a university release said recently.
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第十篇: 来自外星人的信号
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