What If Everyone in Space Is Hiding?

It's 3 a.m. A radio telescope picks up a hello from a star 40 light-years away, and there's a big red button on the desk that says REPLY. Would you press it? In 1950, Enrico Fermi asked a lunch-table question that still has no answer: if our galaxy is packed with planets, where is everybody? This video follows that question into one of its darkest possible answers, the "dark forest" idea from Liu Cixin's science fiction novel, where everyone stays quiet because being noticed feels dangerous. Along the way we ask a frog what happens when you sing too loudly, look at what Earth has already beamed into space (including a little figure made of dots and a Doritos ad), poke at the biggest cracks in the dark forest logic, and weigh the less dramatic reasons a sky full of life could still sound quiet. A quick note on what's established and what isn't: no confirmed signal from an alien civilization has ever been detected. The dark forest is a hypothesis that comes from fiction, not a finding, and a quiet sky doesn't prove that anyone is hiding or that aliens would be hostile. In the video, things we've measured are drawn in ink and guesses are drawn in pencil. Chapters 0:00 3 a.m.: a hello from 40 light-years away 0:55 Where is everybody? 2:22 The dark forest 3:44 Ask a frog 4:46 Meanwhile, on Earth 5:40 Cracks in the forest 7:03 Other ways to be quiet 8:08 Back to 3 a.m. 8:50 A much less scary button If you like questions that get stranger the longer you look at them, subscribe to Drawn To Why (@DrawnToY). Tell us in the comments: would you press reply, and what would you say first? Sources The Fermi Paradox (SETI Institute): https://www.seti.org/fermi-paradox Life in the Universe: What are the Odds? (NASA Science): https://science.nasa.gov/universe/exo... Among Trillions of Planets, Are We 'Home Alone?' (NASA Science): https://science.nasa.gov/universe/exo... Confirmed exoplanet count (NASA Exoplanet Archive): https://exoplanetarchive.ipac.caltech... Up to half of Sun-like stars may host rocky, potentially habitable planets (MIT Technology Review, on the NASA Kepler study by Bryson et al.): https://www.technologyreview.com/2020... "Where Is Everybody?" An Account of Fermi's Question, Eric M. Jones (Los Alamos, 1985): https://www.osti.gov/servlets/purl/57... April 8, 1960: Frank Drake begins Project Ozma (Astronomy): https://www.astronomy.com/today-in-th... The Dark Forest by Liu Cixin (2008; English translation 2015): https://en.wikipedia.org/wiki/The_Dar... Stay home ET. Stephen Hawking: Aliens may pose risks (Phys.org, 2010): https://m.phys.org/news/2010-04-home-... Regarding Messaging to Extraterrestrial Intelligence (METI) / Active SETI, 2015 statement (Berkeley SETI@home): https://setiathome.berkeley.edu/meti_... Frog love song: complex calls attract females, predators and parasites alike (ScienceDaily, 2007): https://sciencedaily.com/releases/200... The Sounds of Silence as an Alarm Cue in Túngara Frogs (Biotropica, 2011): https://doi.org/10.1111/j.1744-7429.2... Bats use water ripples to hunt frogs (University of Texas at Austin, 2014): https://news.utexas.edu/2014/01/23/ba... Nov. 16, 1974: Arecibo sends a message (Astronomy): https://www.astronomy.com/today-in-th... The Arecibo message as a sequence of bits (OEIS A248747): https://oeis.org/A248747 First advertisement to be broadcast into space (ScienceDaily, 2008): https://www.sciencedaily.com/releases... Exoplanets get a cosmic front-row seat to find backlit Earth (Cornell Chronicle, 2021): https://news.cornell.edu/stories/2021... Oxygen levels on early Earth rose and fell several times before the successful Great Oxidation Event (NASA Astrobiology): https://astrobiology.nasa.gov/news/ox... Meet the Habitable Worlds Observatory (The Planetary Society, 2024): https://www.planetary.org/articles/me... We may not have found aliens yet because we've barely begun looking (Science News, 2018): https://www.sciencenews.org/article/o... DTV cut transmission to space aliens, on Frank Drake's 2010 remarks (TV Technology, 2010): https://www.tvtechnology.com/news/dtv... #fermiparadox #darkforest #SETI