How Far Did Dinosaurs Need to Run From the Asteroid?

Fifteen minutes after a rock about ten kilometers wide hit the sea, a T. rex on a riverbank stopped, a hand's width from its kill. That river was nineteen hundred miles from the crater. Was that far enough? This is the last day of the dinosaurs, told from three real places: a lake in what is now Texas, a river that is now North Dakota, and a cold sea off Antarctica, a quarter of the way around the world. At one of them the rock keeps a clock, and you can stand on the bank and follow the day minute by minute: the first tremor, the river that runs the wrong way, the rain of glass. At another, the day is not in the rock at all. Then the clock changes, from minutes to years and centuries, and the question of distance gets a second answer, harder than the first. By the end, the next turtle you see on a log in a pond will mean something different. So will the fact that nothing the size of a T. rex is sitting next to it. ABOUT THE SCIENCE The three places are real: Big Bend National Park, Texas; the Tanis site in the Hell Creek Formation, North Dakota; and Seymour Island, Antarctica. The minutes at the river come from DePalma et al. 2019: the order is in the rock, the minutes are physics. The season comes from the bones of fish that died that day (During et al. 2022). The hour of the day is not known, and the film does not invent one. Where the science is split (heat far from the crater, the length of the dark, why the south recovered faster), the film gives both sides. The animals are reconstructions; the narration says what the rock can and cannot support. The dinosaur on the Antarctic shore rests on a tooth and a few bones from a neighboring island, older than the boundary, and is shown with that warning. The burning sky on the thumbnail is a dramatization: from nineteen hundred miles, the falling asteroid itself was below the curve of the Earth. What that sky did next is in the film, with the evidence. HOW THIS WAS MADE The animals and landscapes of 66 million years ago are AI-generated reconstructions, built shot by shot from the research. The rocks, fossils, figures, satellite data and present-day scenery are real (credits below). No sound from that day survives: the animal calls and the music were made with AI tools from our own descriptions, mixed with real recordings of water, wind and birds. The narrator is a synthetic voice. If something here is wrong, tell us in the comments. We check, and we correct. MAIN SOURCES DePalma et al. 2019, PNAS (the surge deposit at Tanis); During et al. 2022, Nature (the season); Lehman et al. 2022, Geosphere (Big Bend); Witts et al. 2016, Nature Communications, and Petersen et al. 2016, Nature Communications (Seymour Island); Goldin and Melosh 2009, Geology; Morgan et al. 2013, JGR Biogeosciences; Belcher et al. 2015; Johnson et al. 2026, JGR Biogeosciences (heat at the ground); Brugger et al. 2017, GRL; Tabor et al. 2020, GRL; Senel et al. 2023, Nature Geoscience (the impact winter); Range et al. 2022, AGU Advances (the tsunami); Vellekoop et al. 2014, PNAS (the Brazos River); Lyson et al. 2019, Science (recovery); Robertson et al. 2004, GSA Bulletin; Holroyd et al. 2014; Brinkman et al. 2025, Palaeontologia Electronica; Field et al. 2018, Current Biology (who survived); Donovan et al. 2016 (the south recovered faster). IMAGE CREDITS Image credits (some images cropped / modified): Contains modified Copernicus Sentinel data 2022, processed by ESA Figures from M. A. D. During et al. (2022), Nature 603:91–95, doi:10.1038/s41586-022-04446-1, CC BY 4.0 Geologic map of Seymour Island: Crame et al. (2014), PLoS ONE, CC BY-SA 4.0 (text removed, cropped) Javelina Formation: Nick Longrich, CC BY-SA 4.0 Big Bend National Park, Texas: John Cummings, CC BY-SA 3.0 K–Pg boundary clay, Colorado (2 photos): James St. John, CC BY 2.0 Gorgonilla spherules: Hermannbermudez, CC BY 4.0 Tanis fish fossils: NASA Goddard Space Flight Center, CC BY 2.0 Cissites puilosokensis leaf fossil: TyRex Paleobotany, CC BY-SA 4.0 Cenote Yokdzonot: Ryan from Toronto, CC BY 2.0; Ovedc, CC BY-SA 4.0 Licenses: creativecommons.org/licenses/by/2.0 , by/4.0 , by-sa/3.0 , by-sa/4.0 Other images and data: Pexels, Pixabay, public domain and CC0 images from Wikimedia Commons, NASA SRTM (public domain). Natural sound: U.S. National Park Service (public domain) and CC0 recordings via Freesound. Calls, sound design and music: AI-generated from our own prompts. MORE FROM INTO DEEP TIME Two million years of rain, at the side of a six-kilo dinosaur:    • 2 Million Years of Rain: The Small Dinosau...   One day, dawn to dark, in a Late Jurassic valley:    • The Jurassic Period: Walk Through Earth's ...   If this day felt real, a like and a comment help more than you would think. Tell us which of the three places stayed with you. #Dinosaurs #Extinction #Documentary