Visit our sponsor, Brilliant.org: https://brilliant.org/CoolWorlds. Astronomers are on a quest to search for life in the Universe. Two different pathways lay ahead for this hunt, biosignatures and technosignatures. Today, we discuss the arguments for and against each and consider that intelligence could be a far more persistent phenomenon that we might naively think - with important consequences for astronomers... Written and presented by Prof David Kipping of Columbia University → Support our research program: https://www.coolworldslab.com/support → Get Stash here! https://teespring.com/stores/cool-worlds-store THANK-YOU to our supporters T. Widdowson, D. Smith, M. Sloan, L. Sanborn, C. Bottaccini, D. Daughaday, A. Jones, S. Brownlee, Z. Star, T. Zanjonc, C. Wolfred, F. Rebolledo, L. Skov, E. Wilson, M. Elliott, B. Daniluk, J. Patrick-Saunders, M. Forbes, S. Vystoropskyi, S. Lee, Z. Danielson, C. Fitzgerald, V. Alexandrov, L. Macchia, C. Souter, M. Gillette, T. Jeffcoat, H. Jensen, F. Linker, J. Rockett, N. Fredrickson, B. Mlazgar, D. Holland, J. Alexander, E. Hanway, J. Molnar, D. Murphree, S. Hannum, T. Donkin, K. Myers, A. Schoen, K. Dabrowski, J. Black & R. Ramezankhani. ::Music:: Music licensed by SoundStripe.com (SS) [shorturl.at/ptBHI], or via Creative Commons (CC) Attribution License (https://creativecommons.org/licenses/by/4.0/), or with permission from the artist ► Joachim Heinrich - Stratosphere ► Brad Hill - A Slowly Lifting Fog [https://open.spotify.com/track/0GgkyL3y22kFslT6wUsKlt?si=35f82c623b9f486d] ► Chris - Cylinder Five ► Falls - Life in Binary ► Chris - Cylinder Five ► Falls - Ripley ► Chris - The Sun is Scheduled to Come Out Tomorrow ► Joachim Heinrich - Y ► Indive - Trace Correction ::Video clips:: ► Iceland footage by Louis Houiller ► Canada footage by Florian Nick/Arc'teryx ► Starry timelapse by Kuba Jurkowski ► Earth zoom-out by ESO/L. Calçada/M. Kornmesser ► Flask burning video by Science Skool ► Plankt