The Telegraph is reporting that satellite television and the digital revolution is making humanity more and more invisible to inquisitive aliens on other planets:
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That might be good news for anyone who fears an “Independence Day” – style invasion by little green men. But it is also likely to make the search for extra-terrestrial intelligence by Earthly scientists harder, Dr Frank Drake believes.
Dr Drake, who founded the SETI (Search for Extra-terrestrial Intelligence) organisation in the US 50 years ago, said the digital age was effectively gagging the Earth by cutting the transmission of TV and radio signals into space.
At present, the Earth was surrounded by a 50 light year-wide “shell” of radiation from analogue TV, radio and radar transmissions, he said.
But although the signals had spread far enough to reach many nearby star systems, they were rapidly vanishing before the march of digital technology.
To a race of observing aliens, digital TV signals would look like noise, said Dr Drake.