If our civilisation met truly advanced aliens, they might well put us in a planet-sized zoo – much as we do with less intelligent species.

And it might have already happened, scientists have already warned (and that would explain why we’ve never seen any aliens.

At a meeting of the the METI (Messaging Extraterrestrial Intelligence) Project in Paris this week, scientists discussed the idea of whether we really are in a zoo.

Perhaps surprisingly, they also suggested how to attract the attention of the ‘zookeepers’ – and get out.

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