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Sometimes it seems as if the expansion of the social networking phenomenon knows no bounds. Aliens could have been using cosmic 'tweets' to contact us for decades, scientists claim - but we have been missing them, British media reported Thursday. ET is more likely to be sending out short, directed messages than continuous signals beamed in all directions, experts said. The reason? Because alien civilisations are likely to strive to limit waste and make their signalling technology efficient. |
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