Humanity has long been interested in extra-terrestrial life. In 1977, the Voyager space probe was launched containing a lot of information for a possibly intelligent civilisation. The probe contained music tracks, pictures of elderly and young people, and greetings in different languages. Do extra-terrestrial civilisations pose dangers to us? According to Stephen Hawking there might exist more than one extra-terrestrial civilisation, which might be harmful, so we had better just observe instead of messaging. Is Hawking right? What are the chances and hopes for us to receive signals of intelligent life?

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