We are not alone - with 36 intelligent alien races living in our galaxy, according to a new study.
British scientists have calculated that there could be dozens of other extra terrestrial lifeforms within the Milky Way.
But they said it is likely the average distance to such civilisations would be 17,000 light-years - making detection and communication "very difficult" with our present technology.
Their findings, published in The Astrophysical Journal,
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