A mothership the size of Texas has been hovering over Earth for days and we are tired of waiting for answers. We send a rover in to explore, and what we find makes us question the definition of life as we know it. On Earth, the pods multiply and get smaller, making contact with them unavoidable. What will happen to us?

The below guests are featured in this episode: 

• Seth Shostak
• Kevin Grazier
• David Brin
• Hakeem Oluseyi
• Joan Slonczewski
• Paul Davies
• Alan D Foster
• Ariel Anbar
• Malcolm MacIver
• David Gerrold

For even more Alien Encounters, head to discovery+. Go to discoveryplus.com/alienencounters. Terms apply. 

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