Subscribe and to OFFICIAL BBC YouTube https://bit.ly/2IXqEIn Stream original BBC programmes FIRST on BBC iPlayer https://bbc.in/2J18jYJ Programme website: http://www.bbc.co.uk/programmes/p0276pxp Brian Cox explains the mysterious 'Wow!' radio signal picked up in 1977. Scientists speculated ...

It's possible that one day we will come across life on another planet. However, this brings up an important question: How do we measure the intelligence of this alien? It's a complicated question, but Anthony discusses how we might go about it based on what we know about measuring nonhuman ...