Is There Intelligent Life On Other Planets?

How are we looking and listening for intelligent life?

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Now that we know planets are common in our galaxy, how would we tell if one holds life? Sure, it will take incredibly powerful telescopes and ambitious new space missions, but what are we looking for? What are we listening for? How do we help other worlds know that we are here?

Here's the thing: Life on Earth has an expiration date. No matter what humans do, our aging sun will eventually be so hot that we can't survive. If we want to live on, it will have to be beyond Earth. The only question is, will it be US who live on, or just our radio broadcasts and dead satellites?

If you missed Part 1 last week: https://www.youtube.com/watch?v=cvET91EYoyc

Check out "Five Billion Years of Solitude" by Lee Billings: http://amzn.to/18Tzv59

My Sagan + Valentine's Day episode: https://www.youtube.com/watch?v=TekbxvnvYb8

Ray Bradbury reading "If Only We Had Taller Been" courtesy of NASA/JPL

More reading:

The 7 hurdles for a planet to develop intelligent life: http://lgmacweb.env.uea.ac.uk/ajw/Reprints/watson_astrobiology_preprint.pdf

Sagan's rules for life: http://scienceblog.com/community/older/1999/C/199902379.html

Earth is gradually getting more radio quiet: http://www.nytimes.com/2008/03/02/weekinreview/02overbye.html?pagewanted=all&_r=0

Searching for the archaeological ruins of extraterrestrial civilzations: http://www.aeonmagazine.com/nature-and-cosmos/searching-for-the-archaeologicalruins-of-alien-civilisations/

How long will life survive on Earth? http://www.universetoday.com/25367/how-long-will-life-survive-on-earth/

Joe Hanson - Host and writer
Joe Nicolosi - Director
Amanda Fox - Producer
Katie Graham - Director of Photography
Andrew Matthews - Editor and Motion Graphics
Kate Eads - Production Manager

Filmed at Onion Creek Productions in Austin, TX

Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios

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