The brief period of radio silence during the switchover makes it possible to listen for pulsars and other space entities that are otherwise drowned out
Since the days of Philo Farnsworth, radio waves have carried television signals at the frequency of 700 to 800 megahertz. The density and power of those television signals drowned out any radiation from distant stars of the same wavelength.
But now, with the television signals turned off for the switch to digital, astronomers have added a special receiver to the Arecibo radio telescope that enables searches at these previously obscured wavelengths. In particular, astronomers hope to find pulsars, super-dense stars that emit radio waves at regular intervals.
Those astronomers better step on it, though, as cellphone companies have already taken over most of the wavelength space between 700 and 800 megahertz. Before long, the signals from those distant stars will once again fade away behind the noise of human traffic, with the signals from entire galaxies failing to break through the barrage of texts and app store downloads.
[via New Scientist]
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