Astronomers are finding habitable exoplanets everywhere! We are now starting to think about the next step, how can we use our telescopes to look for signs of life on distant worlds? Cool Worlds Lab astronomer Tiffany Jansen talks about possible atmospheric signals that could indicate the presence of a biosphere, but also the abiotic sources that could fool us all. ::More about this Video:: ► Reinhard et al. (2017), "False negatives for remote life detection on ocean-bearing planets: Lessons from the early Earth": https://arxiv.org/abs/1702.01137 ► Hein et al. (2013), "Some inconvenient truths about biosignatures involving two chemical species on Earth-like exoplanets": https://arxiv.org/abs/1404.6531 ► Wordsworth & Pierrehumbert (2014), "Abiotic oxygen-dominated atmospheres on terrestrial habitable zone planets": https://arxiv.org/abs/1403.2713 ► Outro music by Taylor Davis: https://www.youtube.com/watch?v=dl9kI1yQKZk ::Playlists For Channel:: Latest Cool Worlds Videos ► http://bit.ly/NewCoolWorlds Cool Worlds Research ► http://bit.ly/CoolWorldsResearch Guest Videos ► http://bit.ly/CoolWorldsGuests Q&A Videos ► http://bit.ly/CoolWorldsQA Science of TV/Film ► http://bit.ly/ScienceMovies ::Follow us:: SUBSCRIBE to the channel http://bit.ly/CoolWorldsSubscribe Cool Worlds Lab http://coolworlds.astro.columbia.edu Twitter https://twitter.com/david_kipping Instagram https://www.instagram.com/cool.worlds THANKS FOR WATCHING!!