The Big Bang is the reigning explanation for our universe’s origin—but what if it’s wrong? This episode dives into cosmic controversies and the theories that challenge everything we thought we knew.



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Credits:

What If the Big Bang Never Happened?

Episode 730.1; July 6, 2025

Written, Produced & Narrated by: Isaac Arthur

Select imagery/video supplied by Getty Images

Music Courtesy of Epidemic Sound http://epidemicsound.com/creator





What If the Big Bang Never Happened?

Science has shown us the universe began with a Big Bang but what about its endgame? Will everything burn out and freeze over, or collapse in on itself, or rip into shreds? How far away are we from this happening?

Embark on a cosmic journey to the end of the universe with astrophysicist, science communicator, and author of The End of Everything (Astrophysically Speaking), Katie Mack. 

In a public talk, Katie takes us through the latest scientific tolls and data, from space telescopes to particle colliders, to explain the big ideas and key theories of the death of the universe.

Professor Tara Murphy, Head of the School of Physics, hosts this event. 

This podcast is a recording of a live public event held on 10 July 2025. For more links and resources, including the transcript, visit Sydney Ideas website:  bit.ly/40WQfb3

Katie Mack: The end of everything

Join us as we journey beyond the birth of the universe to unravel the mysteries of what might have preceded the Big Bang—and whether time itself had a beginning.

Watch my exclusive video Mass Drivers on the Moon: https://nebula.tv/videos/isaacarthur-mass-drivers-on-the-moon-enabling-a-lunar-economy
Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur
Get a Lifetime Membership to Nebula for only $300: https://go.nebula.tv/lifetime?ref=isaacarthur
Use the link  https://gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $36.


Visit our Website: http://www.isaacarthur.net
Join Nebula: https://go.nebula.tv/isaacarthur
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Credits:
Before the Big Bang - What Came Before Time?
Episode 738; July 20, 2025
Written, Produced & Narrated by: Isaac Arthur
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
0:00 Intro Asking the Impossible
2:08 The Limits of Time and Spacetime
7:45 Beyond the Big Bang: Alternate Beginnings
14:38 Other Realities: Higher Dimensions and Shadow Universes
18:28 Emergent Time
22:38 Bubble Collisions and Multiverse Scars
24:44 Conclusion: What Came Before Time?

Before the Big Bang - What Came Before Time?

Before the Big Bang - What Came Before Time? (Narration Only)

A visceral descent into cosmic inevitability, The End fuses bone-rattling and hard heavy bass, fragmented glitch percussion, with both heavy and warped synths with eerie, processed vocal samples that echo the voices of long-dead physicists pondering the universe's final fate. With peaks of panic and dread balanced by awe and philosophical wonder, the track explores the Big Rip theory—where even atoms are torn asunder. It’s a sonic eulogy for existence itself, both terrifying and beautiful in its scale and potential end.

The End [ShadeFade]

Rogue planets wander the cosmos without stars, but could we still call them home? This episode dives into how humanity might transform these frozen giants into thriving outposts of civilization.

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Credits:
Colonizing Rogue Planets
Written, Produced & Narrated by: Isaac Arthur
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator

Colonizing Rogue Planets

Matt and Jamie dive headfirst into the cosmic foam to explore the Bubble Universe, the mind-bending idea that our universe might be just one of countless “bubbles” in a vast multiverse. From the physics of cosmic inflation and the mysteries of the cosmic microwave background, to the philosophical head-scratchers of infinite realities, they mix hard science, playful analogies, and a touch of pop culture chaos.

#319 Bubble Universe

This lecture discusses key ideas from the ancient philosopher and statesman Marcus Tullius Cicero's work, On The Nature Of The Gods, which critically examines Epicurean, Stoic, and Skeptic perspectives on matters of theology and cosmology

Specifically it focuses upon  the presentation of Stoic cosmology and theology by Quintus Lucilius Balbus in book 2, in particular one of the arguments for the existence of the gods presented by Balbus, which we can call the argument from degrees of being. This type of argument doesn't fit neatly into the modern conventional classification of ontological, cosmological, and teleological arguments for the existence of the divine. It works by noting that there are different degrees (gradus) of being, going from bare being through plants, animals, humans, and other higher rational beings (gods), arguing that the top grade of being cannot be empty or non-existent.

To support my ongoing work, go to my Patreon site - www.patreon.com/sadler

If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO - or at BuyMeACoffee - www.buymeacoffee.com/A4quYdWoM

You can find over 3,500 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler

Purchase Cicero's On The Nature Of Gods - amzn.to/3JITSZc

Cicero On The Nature Of The Gods book 2 - Argument From Degress Of Being - Sadler's Lectures

This lecture discusses key ideas from the ancient philosopher and statesman Marcus Tullius Cicero's work, On The Nature Of The Gods, which critically examines Epicurean, Stoic, and Skeptic perspectives on matters of theology and cosmology

Specifically it focuses upon the presentation of Stoic cosmology and theology by Quintus Lucilius Balbus in book 2, and in particular on the sequence of arguments that he provides, drawing from the works of earlier Stoic authors, intended to make the case for the world itself being God.

To support my ongoing work, go to my Patreon site - www.patreon.com/sadler

If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO - or at BuyMeACoffee - www.buymeacoffee.com/A4quYdWoM

You can find over 3,500 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler

Purchase Cicero's On The Nature Of Gods - amzn.to/3JITSZc

Cicero On The Nature Of The Gods book 2 - Arguments That The World Is God - Sadler's Lectures

In this powerful conversation, Jennifer Jenkins, director of the Southwest Center, speaks with Don Unger, recent PhD and environmental historian, about his groundbreaking research on uranium mining reclamation on the Navajo Nation. Unger discusses the ethics of storytelling, the balance between technical and spiritual approaches to healing the land, and his concept of Critical Reclamation Studies, a framework grounded in both Western policy and Navajo cosmology.
Together, they explore the lived realities of land restoration, long drives and “cabin conversations,” and the wisdom of community leaders like Mr. Melvin Yazzie and Mr. Ernest Greyeyes.
This episode opens a window into environmental justice, language, and the ongoing legacy of Cold War uranium mining in the Southwest.


Don Unger - Critical Reclamation: Uranium, Storytelling, and Healing on the Navajo Nation

Sydney Ideas is the University of Sydney's premier public lecture series program, bringing the world's leading thinkers and the latest research to the wider Sydney community.

Putting The Ace Back Into Space.
Host Matthew Russell's critically acclaimed fun and factual show about all things SPACE. 
New episode every week with a deep dive into the latest hot space topics.  
With regular Interviews and discussions with the worlds top space experts.
From how rockets fly to how blackholes work and everything in-between.

I'm that YouTube Philosophy Guy! Find more than 3,000 videos in my main channel.  Support my video and podcast work!  https://www.patreon.com/sadler or https://www.buymeacoffee.com/A4quYdWoM

Learn more about this podcast channel - https://youtu.be/qRvL0gqlyrw and https://gregorybsadler.substack.com/p/the-sadlers-lectures-podcast

Due to popular demand - and with the work underwritten by my Patreon supporters - I have been converting my videos into MP3 files listeners can listen to anywhere they want!

I have a second podcast, Mind & Desire, publishing original episodes on a variety of topics in philosophy, which you can find here - https://gregorybsadler.substack.com/podcast

The Journal of the Southwest Radio Hour brings the voices of researchers, educators, activists and community members working to better understand the region’s past and envision possible new futures.

New tracks tagged #Cosmology