Cool Worlds

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Many of you wanted me to talk about the Dark Forest Hypothesis - an idea popularised (bit not limited to) the the sci-fi novel and Netflix series, "The Three Body Problem" by Liu Cixin. So in this video I'll explain what dark forest says and why I don't buy it. (Note - this is *not* an analysis of Cixin’s story beats set in his fictional universe, but rather the concept of dark forest in our real one! Although, I will refer to the aliens as Trisolarans purely as a placeholder example civilization).

Written & presented by Prof. David Kipping.

→ Support our research: https://www.coolworldslab.com/support
→ Get merch: https://teespring.com/stores/cool-worlds-store
→ Check out our podcast: www.youtube.com/@CoolWorldsPodcast

THANK-YOU to T. Widdowson, D. Smith, L. Sanborn, C. Bottaccini, D. Daughaday, S. Brownlee, E. West, T. Zajonc, A. De Vaal, M. Elliott, B. Daniluk, S. Vystoropskyi, S. Lee, Z. Danielson, C. Fitzgerald, C. Souter, M. Gillette, T. Jeffcoat, J. Rockett, D. Murphree, M. Sanford, T. Donkin, A. Schoen, K. Dabrowski, R. Ramezankhani, J. Armstrong, S. Marks, B. Smith, J. Kruger, S. Applegate, E. Zahnle, N. Gebben, J. Bergman, C. Macdonald, M. Hedlund, P. Kaup, W. Evans, N. Corwin, K. Howard, L. Deacon, G. Metts, R. Provost, G. Fullwood, N. De Haan, R. Williams, E. Garland, R. Lovely, A. Cornejo, D. Compos, F. Demopoulos, G. Bylinsky, J. Werner, S. Thayer, T. Edris, F. Blood, M. O'Brien, D. Lee, J. Sargent, M. Czirr, F. Krotzer, I. Williams, J. Sattler, B. Reese, O. Shabtay, X. Yao, S. Saverys, A. Nimmerjahn, C. Seay, D. Johnson, L. Cunningham, M. Morrow, M. Campbell, B. Devermont, Y. Muheim, A. Stark, C. Caminero, P. Borisoff, A. Donovan, H. Schiff, J. Cos, J. Oliver, B. Kite, C. Hansen, J. Shamp, R. Chaffee, A. Ortiz, B. McMillan, B. Cartmell, J. Bryant, J. Obioma, M. Zeiler, S. Murray, S. Patterson, C. Kennedy, G. Le Saint, W. Ruf, A. Kochkov, B. Langley, D. Ohman, P. Stevenson, T. Ford, T. Tarrants, A. Laroye, I. Venzor, R. Raszka, B. Gaalen, A. Taylor, D. Wedgewood, J. Alley, D. Aron, G. Thomsen, S. Shardool, B. Kingston, A. Phan Le, N. Voyton, N. Offor, A. Huch, J. Morrison & C. Fitzsimmons.

REFERENCES
► Project Nash 2020, "https://www.projectnash.com/aliens-the-fermi-paradox-and-the-dark-forest-theory/" https://www.projectnash.com/aliens-the-fermi-paradox-and-the-dark-forest-theory/
► Siraj & Loeb 2021, "The Copernican Principle Rules Out BLC1 as a Technological Radio Signal from the Alpha Centauri System": https://arxiv.org/abs/2101.04118
► Carroll-Nellenback et al. 2012, "The Fermi Paradox and the Aurora Effect: Exo-civilization Settlement, Expansion and Steady States", The Astronomical Journal, 158, 117: https://arxiv.org/abs/1902.04450
► Hart 1975, "Explanation for the Absence of Extraterrestrials on Earth", Quarterly Journal of the Royal Astronomical Society, 16, 128

MUSIC
Licensed by SoundStripe.com (SS) [shorturl.at/ptBHI], Artlist.io, via CC Attribution License (https://creativecommons.org/licenses/by/4.0/) or with permission from the artist.
0:00 Hill - A Slowly Lifting Fog
2:24 Kyle Preston - Dark Tension
5:51 Kyle Preston - Up the Oregon Coast
9:41 Hill - The Planet of Lost Souls
12:28 Falls - Ripley
16:10 Chris Zabriskie - Cylinder Seven
20:24 Joachim Heinrich - Y
22:44 Indive - Trace Correction

CHAPTERS
0:00 Dark Forest
4:20 Incogni
5:51 Game Theory
9:13 Game Theory Nuance
15:01 Berserker is Better
20:32 Closing Thoughts
22:44 Outro & Credits

#DarkForest #ThreeBodyProblem #CoolWorlds

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Off the cuff immediate reaction…

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There have been two scientific revolutions involving a "Kepler"- one 400 years ago and one on-going! Prof Kipping explains both and why NASA's Kepler Mission will go down in the history books as transformative.

::More about this Video::

► NASA's Kepler Mission website: http://kepler.nasa.gov
► Burke et al. (2015), "Terrestrial Planet Occurrence Rates for the Kepler GK Dwarf Sample": http://arxiv.org/abs/1506.04175
► Doyle et al. (2011), "Kepler-16: A Transiting Circumbinary Planet": http://arxiv.org/abs/1109.3432
► Johansen et al. (2012), "Can planetary instability explain the Kepler dichotomy?": http://arxiv.org/abs/1206.6898
► 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
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Q&A Videos ► http://bit.ly/CoolWorldsQA
Science of TV/Film ► http://bit.ly/ScienceMovies

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A huge thank-you to everyone who helped us reach this milestone!

→ Support our research: https://www.coolworldslab.com/support
→ Get merch: https://teespring.com/stores/cool-worlds-store
→ Check out our podcast: www.youtube.com/@CoolWorldsPodcast

THANK-YOU to T. Widdowson, D. Smith, L. Sanborn, C. Bottaccini, D. Daughaday, S. Brownlee, E. West, T. Zajonc, A. De Vaal, M. Elliott, B. Daniluk, S. Vystoropskyi, S. Lee, Z. Danielson, C. Fitzgerald, C. Souter, M. Gillette, T. Jeffcoat, J. Rockett, D. Murphree, M. Sanford, T. Donkin, A. Schoen, K. Dabrowski, R. Ramezankhani, J. Armstrong, S. Marks, B. Smith, J. Kruger, S. Applegate, E. Zahnle, N. Gebben, J. Bergman, C. Macdonald, M. Hedlund, P. Kaup, W. Evans, N. Corwin, K. Howard, L. Deacon, G. Metts, R. Provost, G. Fullwood, N. De Haan, R. Williams, E. Garland, R. Lovely, A. Cornejo, D. Compos, F. Demopoulos, G. Bylinsky, J. Werner, S. Thayer, T. Edris, F. Blood, M. O'Brien, D. Lee, J. Sargent, M. Czirr, F. Krotzer, I. Williams, J. Sattler, B. Reese, O. Shabtay, X. Yao, S. Saverys, A. Nimmerjahn, C. Seay, D. Johnson, L. Cunningham, M. Morrow, M. Campbell, B. Devermont, Y. Muheim, A. Stark, C. Caminero, P. Borisoff, A. Donovan, H. Schiff, J. Cos, J. Oliver, B. Kite, C. Hansen, J. Shamp, R. Chaffee, A. Ortiz, B. McMillan, B. Cartmell, J. Bryant, J. Obioma, M. Zeiler, S. Murray, S. Patterson, C. Kennedy, G. Le Saint, W. Ruf, A. Kochkov, B. Langley, D. Ohman, P. Stevenson, T. Ford, T. Tarrants, A. Laroye, I. Venzor, R. Raszka, B. Gaalen, A. Taylor, D. Wedgewood, J. Alley, D. Aron, G. Thomsen, S. Shardool, B. Kingston, A. Phan Le, N. Voyton, N. Offor, A. Huch, J. Morrison & C. Fitzsimmons.

CHAPTERS
0:00 AMA
0:18 Ultimate Telescope
4:32 YouTuber Academic
7:27 Unscientific Belief
9:58 If Not Astronomy...
12:46 Origins Story
18:05 What I Suck At
20:24 Crisis in Physics
25:16 Will We Confirm Life?
28:19 K167e Update
31:49 Coping with Setbacks
36:46 Wildest Hunch
40:03 Fermi Paradox Solution
43:26 Personal Inspirations
46:33 Mental Health Advise
50:20 Career Advise
54:29 Longer Healthspans
59:13 Breakfast?
59:51 BH Singularities
1:00:51 Life Evidence
1:03:48 Sci-Fi Books
1:05:29 Terrascope Update
1:09:12 Science Sensationalism
1:13:09 AI Good or Bad?
1:15:24 Creativity Advise
1:19:06 Thank-you
1:19:51 Outro and Credits

#AMA #CoolWorlds

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Answers to your questions by Prof David Kipping from our "Proxima Planet Hunt" and "Polluted Dead Stars" videos (links below)! Thanks to all of you who posted questions, keep 'em coming, we love interacting with you all!

::More about this Video::

► "Proxima Planet Hunt" video: https://youtu.be/z5LVcfzRDI8
► "Polluted Dead Stars" video: https://youtu.be/MAeqIQd6BMM
► Dressing & Charbonneau (2015), "The Occurrence of Potentially Habitable Planets Orbiting M Dwarfs Estimated from the Full Kepler Dataset and an Empirical Measurement of the Detection Sensitivity": http://arxiv.org/abs/1501.01623
► Veras (2015), "Post-main-sequence planetary system evolution": http://arxiv.org/abs/1601.05419
► 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!!

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Rubin Observatory just came online and one of its main goals is to detect comets and asteroids that could threaten the Earth. But how long will this take? How many threats do we know of so far? And what could we do about it if we discovered one with our name on it? Join us today as we explore just how dangerous the skies can be...

Written & presented by Prof. David Kipping, edited by Jorge Casas.

→ Support our research: https://www.coolworldslab.com/support
→ Get merch: https://teespring.com/stores/cool-worlds-store
→ Check out our podcast: www.youtube.com/@CoolWorldsPodcast

THANK-YOU to T. Widdowson, D. Smith, L. Sanborn, C. Bottaccini, D. Daughaday, S. Brownlee, E. West, T. Zajonc, A. De Vaal, M. Elliott, B. Daniluk, S. Vystoropskyi, S. Lee, Z. Danielson, C. Fitzgerald, C. Souter, M. Gillette, T. Jeffcoat, J. Rockett, D. Murphree, M. Sanford, T. Donkin, A. Schoen, K. Dabrowski, R. Ramezankhani, J. Armstrong, S. Marks, B. Smith, J. Kruger, S. Applegate, E. Zahnle, N. Gebben, J. Bergman, C. Macdonald, M. Hedlund, P. Kaup, W. Evans, N. Corwin, K. Howard, L. Deacon, G. Metts, R. Provost, G. Fullwood, N. De Haan, R. Williams, E. Garland, R. Lovely, A. Cornejo, D. Compos, F. Demopoulos, G. Bylinsky, J. Werner, S. Thayer, T. Edris, F. Blood, M. O'Brien, D. Lee, J. Sargent, M. Czirr, F. Krotzer, I. Williams, J. Sattler, B. Reese, O. Shabtay, X. Yao, S. Saverys, A. Nimmerjahn, C. Seay, D. Johnson, L. Cunningham, M. Morrow, M. Campbell, B. Devermont, Y. Muheim, A. Stark, C. Caminero, P. Borisoff, A. Donovan, H. Schiff, J. Cos, J. Oliver, B. Kite, C. Hansen, J. Shamp, R. Chaffee, A. Ortiz, B. McMillan, B. Cartmell, J. Bryant, J. Obioma, M. Zeiler, S. Murray, S. Patterson, C. Kennedy, G. Le Saint, W. Ruf, A. Kochkov, B. Langley, D. Ohman, P. Stevenson, T. Ford, T. Tarrants, A. Laroye, I. Venzor, R. Raszka, B. Gaalen, A. Taylor, D. Wedgewood, J. Alley, D. Aron, G. Thomsen, S. Shardool, B. Kingston, A. Phan Le, N. Voyton, N. Offor, A. Huch, J. Morrison & C. Fitzsimmons.

MUSIC
Licensed by SoundStripe.com (SS) [shorturl.at/ptBHI], Artlist.io, via CC Attribution License (https://creativecommons.org/licenses/by/4.0/) or with permission from the artist.
0:00 Hill - There Is but One Good [https://open.spotify.com/artist/1hdkvBtRdOW4SPsnxCXOjK]
4:18 Hill - When Comfort Becomes Uncomfortable [https://open.spotify.com/artist/1hdkvBtRdOW4SPsnxCXOjK]
7:24 Hill - World of Wonder [https://open.spotify.com/artist/1hdkvBtRdOW4SPsnxCXOjK]
9:00 Hill - A Flickering Start [https://open.spotify.com/artist/1hdkvBtRdOW4SPsnxCXOjK]
11:51 Hill - Pinhole of Light [https://open.spotify.com/artist/1hdkvBtRdOW4SPsnxCXOjK]
16:22 Hill - Bruised Hope [https://open.spotify.com/artist/1hdkvBtRdOW4SPsnxCXOjK]
20:09 Hill - The Meek [https://open.spotify.com/artist/1hdkvBtRdOW4SPsnxCXOjK]

CHAPTERS
0:00 Prologue
1:13 Populations
4:20 NEOs
7:24 Incogni
9:00 Spaceguard
10:15 Oort Cloud
12:22 Threat Assessment
16:08 Deflection
19:44 Insurance
22:55 Credits

#Asteroid #Rubin #CoolWorlds

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Cool Worlds Lab guest Dr Sarah Ballard from MIT explains how observing dead stars (white dwarfs) can reveal the makeup of exoplanets and even exoplanetesimals! Be sure to follow Sarah on Twitter @hubbahubble and check out her website at http://www.drsarahballard.com.

::More about this Video::

► Farihi et al. (2013), "Evidence for Water in the Rocky Debris of a Disrupted Extrasolar Minor Planet": http://arxiv.org/abs/1310.3269
► Xu et al. (2014), "Elemental Compositions of Two Extrasolar Rocky Planetesimals": http://arxiv.org/abs/1401.4252
► Vanderburg et al. (2015), "A disintegrating minor planet transiting a white dwarf": http://arxiv.org/abs/1510.06387
► 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!!

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Light sails are a promising method for traveling through space - indeed, Breakthrough Starshot proposed a laser driven version could reach nearby stars. But the exorbitant costs and engineering challenges of such a proposal have stymied its realization. What if there was a way of using the Sun - no lasers required - but keeping our dream of interstellar travel in tact? Introducing TARS.

This video is based on published research
(see https://arxiv.org/abs/2507.17615 ) supported by the Cool Worlds donors (see below). Written & presented by Prof. David Kipping.

→ Support our research: https://www.coolworldslab.com/support
→ Get merch: https://crowdmade.com/collections/cool-worlds
→ Check out our podcast: www.youtube.com/@CoolWorldsPodcast

Check out Anton’s Starshot video at https://youtu.be/HwPTF_TZvWY

THANK-YOU to D. Smith, C. Bottaccini, D. Daughaday, S. Brownlee, E. West, T. Zajonc, A. De Vaal, M. Elliott, B. Daniluk, S. Vystoropskyi, S. Lee, Z. Danielson, C. Fitzgerald, C. Souter, M. Gillette, J. Rockett, M. Sanford, T. Donkin, A. Schoen, K. Dabrowski, J. Armstrong, B. Smith, J. Kruger, J. Bergman, C. Macdonald, M. Hedlund, N. Corwin, K. Howard, L. Deacon, G. Metts, R. Provost, G. Fullwood, N. De Haan, R. Williams, E. Garland, R. Lovely, D. Compos, F. Demopoulos, T. Edris, M. O'Brien, D. Lee, M. Czirr, I. Williams, B. Reese, A. Nimmerjahn, C. Seay, D. Johnson, L. Cunningham, M. Morrow, M. Campbell, B. Devermont, P. Borisoff, H. Schiff, J. Cos, C. Hansen, R. Chaffee, A. Ortiz, B. McMillan, B. Cartmell, J. Bryant, J. Obioma, M. Zeiler, S. Murray, S. Patterson, C. Kennedy, G. Le Saint, W. Ruf, A. Kochkov, B. Langley, P. Stevenson, T. Ford, A. Laroye, I. Venzor, R. Raszka, B. Gaalen, J. Alley, D. Aron, G. Thomsen, S. Shardool, B. Kingston, A. Phan Le, N. Offor, A. Huch, J. Morrison & C. Fitzsimmons.

MUSIC
Licensed by SoundStripe.com (SS) [shorturl.at/ptBHI], Artlist.io, via CC Attribution License (https://creativecommons.org/licenses/by/4.0/) or with permission from the artist.
0:00 Hill - Circle
3:37 Hill - Rough Mix
6:51 Sid Acharya - Stories from the Sky
8:15 Kyle Preston - An Ocean of Quiet Confession
10:40 Atlas - Waking Up
14:43 Hill - There is but One Good
19:57 One Guitar Orchestra (@OneGuitarOrchestra) - No Time For Caution
22:19 Hill - Interstellar
25:28 Hill - Rough Mix

CHAPTERS
00:00 Echoes
00:30 Sea Longing
4:06 Breakthrough Starshot
6:51 The Cavalry Ain't Coming
8:39 The Art of Pragmatism
10:54 No Lasers Required
14:31 Enter the Quasite
16:39 Going Interstellar
18:32 Optimization
20:19 For Our Next Trick
23:26 Juicing TARS
27:13 Closing Thoughts
28:55 Outro and Credits

#TARS #Interstellar #CoolWorlds

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New research paper from the Cool Worlds Lab about one the most exciting missions ever proposed, "Starshot". Starshot plans to send tiny probes to distant planets beyond our Solar System, the first true interstellar spacecraft. To do this within our lifetimes requires a very fast probe, reaching one-fifth the speed of light. That means Einstein's theory of special relativity starts to become important and so in our new paper, explained in the video, we figured out how much of a difference that makes...

::More about this Video::

► David Kipping (2017), "Relativistic Light Sails": https://arxiv.org/abs/1704.04310
► Live stream of the Breakthrough Discuss meeting at Stanford (04/20-04/21): https://www.facebook.com/BreakthroughPrize
► Breakthrough Initiatives website: https://breakthroughinitiatives.org
► Cool Worlds Lab website: http://coolworlds.astro.columbia.edu
► Columbia University Department of Astronomy: http://www.astro.columbia.edu
► Background music by Thomas Bergersen "Final Frontier": http://www.thomasbergersen.com

::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!! ヅ

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Click https://betterhelp.com/coolworlds for 10% off your first month of therapy with our sponsor BetterHelp. Join over 4 million people who’ve met with a therapist on BetterHelp and started living a healthier, happier life.

We usually celebrate the big wins, the major discoveries, the eureka moments... but sometimes the most important moments in science aren't like this. Today we explore a pivotal moment that may have saved the field of exoplanets from a much darker path...

Written & presented by Prof. David Kipping. Thanks to Matt Bailes for graciously coming on.

→ Support our research: https://www.coolworldslab.com/support
→ Get merch: https://teespring.com/stores/cool-worlds-store
→ Check out our podcast: www.youtube.com/@CoolWorldsPodcast

THANK-YOU to D. Smith, M. Sloan, L. Sanborn, C. Bottaccini, D. Daughaday, A. Jones, S. Brownlee, N. Kildal, Z. Star, E. West, T. Zajonc, C. Wolfred, L. Skov, G. Benson, A. De Vaal, M. Elliott, B. Daniluk, S. Vystoropskyi, S. Lee, Z. Danielson, C. Fitzgerald, C. Souter, M. Gillette, T. Jeffcoat, J. Rockett, D. Murphree, T. Donkin, K. Myers, A. Schoen, K. Dabrowski, J. Black, R. Ramezankhani, J. Armstrong, K. Weber, S. Marks, L. Robinson, S. Roulier, B. Smith, J. Cassese, J. Kruger, S. Way, P. Finch, S. Applegate, L. Watson, E. Zahnle, N. Gebben, J. Bergman, E. Dessoi, C. Macdonald, M. Hedlund, P. Kaup, C. Hays, W. Evans, D. Bansal, J. Curtin, J. Sturm, RAND Corp., M. Donovan, N. Corwin, M. Mangione, K. Howard, L. Deacon, G. Metts, R. Provost, B. Sigurjonsson, G. Fullwood, B. Walford, J. Boyd, N. De Haan, J. Gillmer, R. Williams, E. Garland, A. Leishman, A. Phan Le, R. Lovely, M. Spoto, A. Steele, K. Yarbrough, A. Cornejo, D. Compos, F. Demopoulos, G. Bylinsky, J. Werner, B. Pearson, S. Thayer, T. Edris, B. Seeley, F. Blood, M. O'Brien, P. Muzyka, D. Lee, J. Sargent, M. Czirr, F. Krotzer, I. Williams, J. Sattler, J. Smallbon, B. Reese, J. Yoder, O. Shabtay, X. Yao, S. Saverys & M. Pittelli

REFERENCES
► Bailes, M., Lyne, A. & Shemar, S. 1990, "A planet orbiting the neutron star PSR1829–10", Nature 352, 311: https://www.nature.com/articles/352311a0

MUSIC
Licensed by SoundStripe.com (SS) [shorturl.at/ptBHI], Artlist.io, via CC Attribution License (https://creativecommons.org/licenses/by/4.0/) or with permission from the artist.
0:00: Arc - Hill
0:30: Falls - Ripley
2:07: Cylinder Seven - Chris Zabriskie
6:39: There is But One Good - Hill
24:32: Y - Joachim Heinrich

CHAPTERS
0:00 Nightmare Scenario
2:24 Astronomical Errors
4:55 BetterHelp
6:39 PSR 1829
8:49 Matt Bailes Interview
24:51 Painful Truths
26:54 Outro & Credits

#Integrity #Science #CoolWorlds

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