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3: Where on Earth are all the Aliens?

 

 

 

 

 

 

What are aliens, and how would we know if we found one?  Astrobiologist Professor Steve Pointing joins comedian Ben Hurley and host Dr Michelle Dickinson on a journey of discovery starting with his research into life forms that survive in hostile environments here on earth.  Armed with this knowledge, the team contemplate what life might look like on other planets, whether or not we could find aliens within our lifetime and whether spiders are actually aliens already living here.

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