Rare Earth, Great Filters and the Fermi Paradox

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• What is the Fermi Paradox?
• What is meant by 'habitable zone?
• What is Kardeshev's scale based on?
• What is meant by the concept of a "Great Filter"
• Give three examples of Great Filters.  
• Do you think the filter is front of us or behind us?  Explain.  

River Erosion

Some videos to support this week's assignment.