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Explore Is There Life on Earth? with 2,404,868 views, 60,000 likes, and 5,246 comments. Experience the impact of this video content that has captured audience attention.

I mean… how do you really know? SUBSCRIBE so you don’t miss a video! ►► http://bit.ly/iotbs_sub ↓↓↓ More info and sources below ↓↓↓ If we lived light years from Earth, how would we know there’s life here? Let’s take a look at the search for extraterrestrial life on habitable exoplanets, and discover what biosignatures would show someone else that we’re here. REFERENCES: http://exoplanet.eu/ Kaltenegger, Lisa. “How to Characterize Habitable Worlds and Signs of Life.” Annual Review of Astronomy and Astrophysics 55, no. 1 (August 18, 2017): 433–85. https://doi.org/10.1146/annurev-astro-082214-122238. Sagan, Carl. “Is There Life On Earth?” Engineering and Science 35, no. 4 (1972): 16–19. Sagan, Carl, W. Reid Thompson, Robert Carlson, Donald Gurnett, and Charles Hord. “A Search for Life on Earth from the Galileo Spacecraft.” Nature 365 (October 21, 1993): 715. Schwieterman, Edward W., Nancy Y. Kiang, Mary N. Parenteau, Chester E. Harman, Shiladitya DasSarma, Theresa M. Fisher, Giada N. Arney, et al. “Exoplanet Biosignatures: A Review of Remotely Detectable Signs of Life.” Astrobiology 18, no. 6 (June 2018): 663–708. https://doi.org/10.1089/ast.2017.1729. Seager, Sara, and Drake Deming. “Exoplanet Atmospheres.” Annual Review of Astronomy and Astrophysics 48, no. 1 (August 2010): 631–72. https://doi.org/10.1146/annurev-astro-081309-130837. ----------- FOLLOW US: Twitter: @DrJoeHanson @okaytobesmart Instagram: @DrJoeHanson Merch: https://store.dftba.com/collections/its-okay-to-be-smart Facebook: http://www.facebook.com/itsokaytobesmart BOOKS WE’VE FEATURED: http://smart-books.tumblr.com/ ----------- It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D. Director: Joe Nicolosi Writer: Joe Hanson Creative Director: David Schulte Editors/animators: Derek Borsheim and Sara Roma Producers: Stephanie Noone and Amanda Fox Produced by PBS Digital Studios Music via APM Stock images from Shutterstock http://www.shutterstock.com

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