< iframe width="480" height =" 320" src =" https://www.youtube.com/embed/p7wBda0GE4Q?rel=0" frameborder =" 0" allowfullscreen > I suggest ... exactly how do you truly know? SUBSCRIBE so you do not miss out on a video! ► ► http://bit.ly/iotbs_sub ↓ ↓ ↓ Even more information and also sources below ↓ ↓ ↓. If we lived light years from Planet, how would certainly we understand there's life right here? Allow's take an appearance at the search for extraterrestrial life on habitable exoplanets, and uncover what biosignatures would certainly show another person that we're here. REFERENCES:. http://exoplanet.eu/. Kaltenegger, Lisa. "Exactly How to Identify Habitable Globes and Indications of Life." Yearly Evaluation of Astronomy and also 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 as well as Science 35, no. 4 (1972 ): 16-- 19. Sagan, Carl, W. Reid Thompson, Robert Carlson, Donald Gurnett, as well as Charles Hord. "A Look for Life in the world 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 Testimonial of From Another Location Detectable Indications 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 Evaluation of Astronomy as well as Astrophysics 48, no. 1 (August 2010): 631-- 72. https://doi.org/10.1146/annurev-astro-081309-130837. -----------. COMPLY WITH 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 INCLUDED:. http://smart-books.tumblr.com/. -----------. It's Okay To Be Smart is hosted by Joe Hanson, Ph.D . Director: Joe Nicolosi. Writer: Joe Hanson. Innovative Director: David Schulte. Editors/animators: Derek Borsheim as well as Sara Roma. Producers: Stephanie Noone as well as Amanda Fox. Generated by PBS Digital Studios. Music using APM. Stock photos from Shutterstock http://www.shutterstock.com