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Cosmology & astrophysics: videos Hacker News recommends
Cosmology and astrophysics: black holes, dark matter, dark energy, Big Bang, galaxies, stars, gravitational waves, exoplanets, the observable universe, Sabine Hossenfelder, Kurzgesagt. Below: every video in this topic that at least three HN users linked with real commentary, in at least three different months (73 explainers, 7 lectures, 6 demos), best-scored first, with the comments on each video page.
- 13 HN recommenders 12 months 2019–2025M melodysheep · documentaryHN people recommend it as a stunning, mind-bending and existentially humbling view of deep time, and it appears on lists of favorite YouTube videos.
- 10 HN recommenders 9 months 2020–2025L Launch Pad Astronomy · explainerHN strongly recommends it as the clearest, best-illustrated explanation of the solar gravitational lens idea, and links it whenever exoplanet imaging comes up.
- 9 HN recommenders 8 months 2012–2025E Eames Office · documentaryHN commenters recommend it as the classic visualization for building intuition about scale, and it comes up whenever a thread concerns scale or size comparisons.
- 7 HN recommenders 7 months 2009–2024R Richard Dawkins Foundation for Reason & Science · lectureHN regards it as a famous, mesmerizing talk, especially for the point that distant galaxies will become unobservable.
- 8 HN recommenders 6 months 2020–2026Called the best visualization of general relativity by many commenters, who say it cleared up long-held misunderstandings of gravity.
- 5 HN recommenders 5 months 2011–2026HN commenters return to it for perspective, comfort and Sagan's soothing voice, and suggest watching it periodically.
- 4 HN recommenders 6 months 2023–2024It is the go-to explanation whenever a thread touches on imaging exoplanets or solar gravitational lens telescopes.
- 5 HN recommenders 5 months 2016–2022M morn1415 · explainerShared as a go-to humbling look at cosmic scale, noted for its chilling audio and visuals pairing.
- 7 HN recommenders 5 months 2020–2025HN links it as a go-to intuitive explanation whenever gravity as spacetime curvature or free fall comes up.
- 3 HN recommenders 5 months 2019–2025Recommended whenever threads need an intuition for the vast distances between stars.
- 7 HN recommenders 5 months 2013–2021T TVO Docs · lectureHN commenters recommend it as an accessible yet substantive introduction to the holographic principle and black hole information, often when related physics news comes up.
- 4 HN recommenders 5 months 2017–2022HN recommends Isaac Arthur as an entry point for far-future and thermodynamic-endgame questions.
- 4 HN recommenders 4 months 2023–2025HN commenters recommend it for the sense of perspective it gives on deep time and how brief human history is.
- 4 HN recommenders 5 months 2020–2025HN people point to it as an excellent explanation of using Earth's atmosphere or gravity as a lens in astronomy threads.
- 3 HN recommenders 4 months 2020–2025HN returns to it whenever moving the solar system, Kardashev civilizations or generation ships come up, with some calling it their favorite Kurzgesagt video.
- 4 HN recommenders 4 months 2018–2025Recommended as the cleanest visual explanation of time and space switching roles past the horizon, and a gateway to the channel's black hole videos.
- 5 HN recommenders 4 months 2023–2024HN links it to correct the common misconception about dark matter and as a counterpoint to popular science coverage, though one commenter found it muddled.
- 4 HN recommenders 4 months 2018–2023HN points to it for black hole energy and colonization ideas and recommends the whole channel.
- 8 HN recommenders 4 months 2019–2021Recommended for correctly predicting the features of the real black hole image and clearly explaining the lensing physics behind it.
- 4 HN recommenders 4 months 2015–2023S Stanford Institute for Theoretical Physics · lectureCommenters recommend it as a clear, characteristically engaging Susskind lecture for people trying to grasp the entanglement and gravity connection.
- 4 HN recommenders 4 months 2021–2026Offered as a readable explainer whenever Venus terraforming or alternatives to Mars colonization come up.
- 4 HN recommenders 4 months 2024–2026HN links it whenever the Moon's orbit comes up, as a concise explanation of why the Moon always curves toward the Sun.
- 3 HN recommenders 4 months 2017–2022Recommended as a high-level but clear explanation of the black hole information paradox and competing theories, by a physicist known for making quantum mechanics approachable.
- 4 HN recommenders 4 months 2016–2022HN links it in Mars-colonization threads as a concise case for Venus.
- 3 HN recommenders 3 months 2017–2021HN commenters recommend Arthur's Fermi Paradox videos as a thorough, clear treatment of the subject.
- 4 HN recommenders 4 months 2017–2025D Dobson Astro-Initiatives · tutorialRecommended to anyone interested in telescope making as a guide from Dobson himself.
- 2 HN recommenders 3 months 2017–2026N Nicolas Bustos · videoCommenters recommend it as an awe-inspiring way to feel Earth's rotation and our place in space.
- 3 HN recommenders 3 months 2019–2021Recommended as a clear, layman-friendly explanation of the Hubble tension from a channel regarded well by physicists.
- 3 HN recommenders 3 months 2020–2023HN points to it as a short, approachable starting point on warp drive physics from a channel commenters like.
- 3 HN recommenders 3 months 2016–2020HN commenters point to the PBS Space Time series as a high-quality, bite-sized way to learn modern physics concepts.
- 3 HN recommenders 3 months 2019–2025Commenters call it a short, clean, visual explanation of the infalling-particle question and of Penrose diagrams.
- 3 HN recommenders 3 months 2019–2024Recommended as an accessible and correct explanation of Hawking radiation for non-physicists.
- 3 HN recommenders 3 months 2019–2023HN readers point to it as a clear explanation of a theoretical fuel-free propulsion concept from a channel they respect.
- 3 HN recommenders 3 months 2014–2025HN commenters link it as a quick, intuitive explanation of angular momentum and why spinning clumps of matter flatten.
- 5 HN recommenders 3 months 2016–2021HN commenters recommend it as an accessible but deep explanation of black holes that corrects popular misconceptions.
- 3 HN recommenders 3 months 2018–2021HN recommends it as a sober analysis of 'Oumuamua theories that counters the alien-spacecraft claims.
- 2 HN recommenders 3 months 2019–2024HN commenters point to it as a well-argued rebuttal of Dark Forest axioms, and recommend his wider Fermi Paradox series.
- 3 HN recommenders 3 months 2010–2020A American Museum of Natural History · demoHN people share it as an eye-opening, moving visualization of the scale of the universe.
- 3 HN recommenders 3 months 2015–2023S Stanford Institute for Theoretical Physics · lectureHN people point to it as the more detailed follow-up when articles touch on entanglement, holography and black holes.
- 3 HN recommenders 3 months 2013–2022S Santiago Ginnobili · demoHN uses it as a vivid demonstration that Fourier series and epicycles can fit anything, and as a warning about models with too much wiggle room.
- 3 HN recommenders 3 months 2018–2022HN commenters point to it in population and megacity discussions, mainly for its estimates of how many people arcologies could support and the heat, power and elevator bottlenecks.
- 3 HN recommenders 3 months 2018–2024HN links it as a concise, accessible explainer whenever the Fermi paradox or Great Filter comes up, though one commenter criticized its lack of source attribution.
- 2 HN recommenders 2 months 2025–2026HN recommends it as an excellent explanation of how we know cosmic distances.
- 5 HN recommenders 2 months 2023–2025Frequently linked as an in-depth, well-presented skeptical take whenever Loeb's alien claims come up.
- 3 HN recommenders 3 months 2023M Merged Podcast · podcast episodeHN commenters point to it for Hanson's grabby aliens reasoning as an unusual framework for thinking about UFO behavior and intelligent life in the cosmos.
- 2 HN recommenders 2 months 2019–2022HN commenters point to it as an accessible way to get a grip on AdS/CFT and the holographic principle whenever black holes or information physics come up.
- 3 HN recommenders 2 months 2022–2024F Fraser Cain · interviewHN points to it as the best accessible explanation of the solar gravitational lens mission plan.
- 3 HN recommenders 3 months 2024HN points to her videos as a counterpoint to popular dark matter discussion, framing it as the discrepancy that needs explaining.
- 3 HN recommenders 3 months 2021–2023Praised for its visualizations and pedagogy in threads about physics and differential geometry.
- 2 HN recommenders 2 months 2022–2025U UCLA · lectureHN recommends it as an accessible and elegant tour of how indirect reasoning builds up cosmic measurements, with one commenter calling it their favorite Tao work.
- 2 HN recommenders 2 months 2019–2021Recommended in Fermi paradox threads as a thorough and reasoned treatment of Dyson sphere detectability.
- 3 HN recommenders 2 months 2017–2019HN recommends it as a good layperson explanation of how LIGO's detection works and why it is so hard.
- 2 HN recommenders 2 months 2014–2022S Santa Fe Institute · lectureHN commenters recommend it as a clear explanation of why time runs one way, from a leading physicist.
- 2 HN recommenders 2 months 2012–2022D Deep Astronomy · explainerRecommended as a way to grasp the scale of the universe and what the Hubble deep field image means.
- 2 HN recommenders 2 months 2021–2023HN recommends it as a good, non-sensational presentation of Loeb's actual argument, usually linked in Oumuamua threads.
- 2 HN recommenders 2 months 2017–2020HN commenters recommend the two-part Kurzgesagt pair as an engaging, accessible introduction to the Fermi paradox and the Great Filter.
- 2 HN recommenders 2 months 2017–2022Used as a go-to reference for relativity arguments, such as spacetime intervals being the same for all observers, and as a suggested follow-up for physics fans.
- 2 HN recommenders 2 months 2021–2023Recommended as an accessible, curious-undergraduate-level overview of dark matter and its alternatives.
- 2 HN recommenders 2 months 2023Commenters recommend it for a compelling, accessible case against treating the speed of light as a hard limit.
- 2 HN recommenders 2 months 2018–2021HN recommends it as a clear explanation of how information may be encoded on a black hole's surface.
- 3 HN recommenders 2 months 2019–2024V Verge Science · explainerHN recommends it as an accessible demonstration of how anyone can collect micrometeorites at home.
- 2 HN recommenders 2 months 2020–2025P Premier Unbelievable? · interviewPointed to for Penrose's own explanations of the Big Bounce and his three-worlds idea.
- 2 HN recommenders 2 months 2019–2021HN commenters point to it as an accessible explanation of abstract modern physics around the black hole information problem.
- 2 HN recommenders 2 months 2018–2022HN points to it in warp drive discussions as a math-free explanation of why superluminal travel causes causality problems.
- 2 HN recommenders 2 months 2020–2023HN recommends it as a clearer explanation of Penrose's cyclic cosmology than comment threads can give.
- 2 HN recommenders 2 months 2017–2022It is cited in string theory arguments as a counterweight to critics, a working physicist's reason to think there is something to the theory.
- 2 HN recommenders 2 months 2022–2025HN uses it as a quick, accessible introduction to the black hole star concept in threads about early-universe black holes.
- 2 HN recommenders 2 months 2020–2024HN commenters recommend it as a helpful way to conceptualize why light speed is a limit.
- 2 HN recommenders 2 months 2021–2022R Rational Animations · explainerRecommended as a short explanation of a non-intuitive anthropic reasoning argument.
- 2 HN recommenders 2 months 2020–2025Linked as a quick, clear primer when black hole energy and efficiency come up.
- 2 HN recommenders 2 months 2018–2021Linked as a nice summary of how civilizations could harvest black hole energy.
- 3 HN recommenders 2 months 2021–2024Cited in cosmology threads as an accessible visual explanation of the unreachable universe and its expansion limits.
- 1 HN recommenders 1 months 2022–2025Recommended as a great visual explanation of the infall experience, including when spaghettification happens.
- 1 HN recommenders 1 months 2020–2023Recommended as an approachable case that the Everett (many-worlds) interpretation is the simplest reading of quantum mechanics.
- 1 HN recommenders 1 months 2020–2024Used as a go-to reference for cosmology questions about the beginning of time and the universe's scale.
- 1 HN recommenders 1 months 2021–2023Recommended as a good explanation of what happens when gravity acts on an object.
- 1 HN recommenders 1 months 2014–2026F Future of Humanity Institute · talkCited as a source for the feasibility of colonizing the universe with self-replicating probes and for building a Dyson swarm from Mercury.
- 1 HN recommenders 1 months 2022–2023Cited as an accessible pointer when threads discuss black hole models that avoid singularities.
- 3 HN recommenders 1 months 2018–2020HN points to it as a clear explanation of the evidence that gravity does not propagate into extra dimensions.
- 1 HN recommenders 1 months 2023–2025Recommended as a solid, informative treatment of silicon-based life and the chemical limits on alien biochemistry.
- 1 HN recommenders 1 months 2021–2023HN cites it in asteroid threads for how well-tracked large asteroids are and how hard deflection is.
- 1 HN recommenders 1 months 2024HN refers to it for the notion that big black holes are not very dense and that universes could form inside black holes.
- 1 HN recommenders 1 months 2017–2023HN points to it as the accessible introduction to Matrioshka Brains whenever very large computational structures come up.
- 1 HN recommenders 1 months 2017–2022HN references it in threads on megastructures, Kardashev civilizations and Dyson sphere detection, and recommends the channel for in-depth futurist content.
- 1 HN recommenders 1 months 2023–2024HN commenters bring it up in threads about asteroid samples and panspermia as an accessible take on early-universe habitability.
- 1 HN recommenders 1 months 2023–2024HN brings it up in threads on ancient civilizations and detecting past technology in geology.
- 1 HN recommenders 1 months 2020–2025HN links it as an approachable interview with a working astronomer who is also a Jesuit, whenever the Vatican Observatory or science and religion comes up.
- 2 HN recommenders 1 months 2022–2024D Dr. Becky · explainerRecommended as an accessible layperson introduction to the Hubble tension when new expansion-rate results make the news.
- 1 HN recommenders 1 months 2022–2023Pointed to as a clear treatment of the universe-in-a-black-hole idea whenever black hole cosmology comes up.
- 2 HN recommenders 1 months 2023–2024N NASA's Ames Research Center · demoHN commenters link it as a cool visualization whenever Theia and Moon formation come up.
- 1 HN recommenders 1 months 2021P Peter Mulvey · music videoBrought up in Fermi paradox and alien-contact threads as a song that makes the point about distance in time and space.
- 1 HN recommenders 1 months 2022–2023N nature video · explainerLinked as a quick visual intro to Laniakea and large-scale cosmic structure.
- 1 HN recommenders 1 months 2023–2025Cited in discussions of cosmic rays and alien threats, especially the idea of sterilizing a planet from afar with an electron beam.
- 1 HN recommenders 1 months 2023–2024HN uses it as an approachable treatment of whether an earlier industrial civilization would be detectable in geology.
- 1 HN recommenders 1 months 2015–2025T To Scale: · documentaryShared as the best visceral demonstration of solar system scale.
- cited 6× 0 months 2019–2026D DjSadhu · demoHN mostly cites it as the closest available visualization of the Earth's path through space, with caveats that it is exaggerated and inaccurate.
- cited 4× 0 months 2024Cited in black hole threads as an approachable introduction to Penrose diagrams and what happens inside a black hole.
- cited 4× 0 months 2019–2024HN uses it as a quick visual reference for how asteroid detection capability grew and how discovery patterns are biased by survey geometry.
- cited 4× 0 months 2019–2020HN commenters link it in propulsion and space threads as an episode on interstellar travel that needs no unknown physics.
- cited 3× 0 months 2018–2024E European Southern Observatory (ESO) · videoHN links it as direct observational evidence for a massive invisible object at the galactic center.
Showing the 100 best-scored of 106. Use search to find the rest.
Questions
What is the most recommended cosmology & astrophysics video on Hacker News?
TIMELAPSE OF THE FUTURE: A Journey to the End of Time (4K) by melodysheep: HN people recommend it as a stunning, mind-bending and existentially humbling view of deep time, and it appears on lists of favorite YouTube videos.
How is this cosmology & astrophysics list ranked?
By HackerTube's score: the number of distinct months in which an HN comment recommended the video, plus half a point for every month with a strong recommendation. One viral thread counts less than steady recommendations over years.
Where do the videos come from?
From every Hacker News comment between 2007 and 2026 that linked a YouTube video, labeled by an AI model as a recommendation, a citation, a joke or a criticism. The list is published by HackerTube under ODC-By 1.0; this edition adds indexable pages and the comment context.
Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.