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NASA is set to broadcast a message deep into outer space that will tell alien civilisations how to find us and who we are.
It's an updated version of previous messages sent in 1974, but using technological advances to give rather more detailed directions about planet earth and a fuller explanation of what makes us tick.
Anders Sandberg is a senior research fellow at Oxford University's Future of Humanity Institute and he's not sure such open-ness is a good idea.
He spoke to Corin Dann.