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TV switch-over triggers rush to see rare stars

发布时间:2017-10-06 02:01:07来源:未知点击:

By Rachel Courtland US SKIES are clearer than usual after the switch in June from analogue to digital TV freed up a chunk of the radio spectrum. Astronomers are now rushing to see what they can find before transmissions from cellphone companies and others fill the space. Prior to the switch-over, naturally occurring radio waves at frequencies between 700 and 800 megahertz were obscured by analogue TV signals,