In tomorrow’s world, cities may rise into the clouds, dive beneath oceans, or float among the stars—join us as we journey through these radical urban frontiers.

Watch my exclusive video Antimatter Propulsion: Harnessing the Power of Annihilation - https://nebula.tv/videos/isaacarthur-antimatter-propulsion-harnessing-the-power-of-annihilation
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Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30.
 
Visit our Website: http://www.isaacarthur.net
Join Nebula: https://go.nebula.tv/isaacarthur
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Credits:
Cities of the Future 
Episode 498; May 8, 2025
Written, Produced & Narrated by: Isaac Arthur
 Edited by: Briana Brownell & Thomas Owens
Graphics: Bryan Versteeg, Ervin Oprea, Ken York YD Visual, Sergio Botero
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector", "Wonder Cycle"
Taras Harkavyi, "Alpha and..."
Stellardrone, "Red Giant", "Billions and Billions"

498 V Cities of the Future May 8, 2025

Are we alone in the universe—or just early to the party? We’ll explore the math, models, and megastructures that might answer how many alien civilizations are out there, and why the night sky remains so quiet.

Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding

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Get a Lifetime Membership to Nebula for only $300: https://go.nebula.tv/lifetime?ref=isaacarthur

Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30.


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Credits:

How Many Alien Civilizations Are There?

Episode 723; June 8, 2025 

Written, Produced & Narrated by: Isaac Arthur

Editor: Ludwig Luska

Graphics: Ken York YD Visual

Select imagery/video supplied by Getty Images

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

Phase Shift, "Forest Night"

 Chris Zabriskie, "Unfoldment, Revealment" & "A New Day in a New Sector" 

Koalips, "Kvazar"

 Stellardrone, "Red Giant" & "Billions and Billions"

How Many Alien Civilizations Are There? (Narration Only)

The gremlins in Negoba's studio decided to steal snippets of his previous OSC's to create a monster destined to confound and disgust all listeners. Unbeknownst to them, their creation (Jenkins) instead prefers cuddles and long walks on the beach.

All sounds created using Odin2 Softsynth by Wave Warden for KVR OSC #197.

Mix of stock presets, tweaked presets, and init. Shout back a bit to a previous track where I used Odin on an open round. I think I’ve learned a little since then.

Jenkins Knows He Ain't Pretty - OSC 197 Odin2

Transhumanism promises a better humanity—or perhaps something no longer human at all. Join us as we explore the moral dilemmas and future paths of human augmentation.

Watch my exclusive video Mass Drivers on the Moon: https://nebula.tv/videos/isaacarthur-mass-drivers-on-the-moon-enabling-a-lunar-economy
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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:
How Would Aliens Behave?
July 13, 2025; Episode 732
Written, Produced & Narrated by: Isaac Arthur
Editor: Donagh Broderick
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
Stellardrone, "Red Giant", "Billions and Billions"
Taras Harkavyi, "Alpha and..."

The Ethics of Transhumanism (Narration Only)

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? (Narration Only)

Entry for the "KVR One Synth Challenge #197: Odin 2"

Title: Sleipnir's Ride
BPM: 134

DAW: Bitwig 5.3.12

Instruments:
* Odin 2: 16 instance

Bitwig Devices:
* Delay+, Reverb, Chorus+, Compressor+, Compressor, Peak Limiter, Dynamics, Saturator, EQ+, EQ-2, Tool, Multiband FX-2, Mid-Side Split, Oscilloscope, Spectrum

Third party:
* OTT, Youlean Loudness Meter

BlitBit - Sleipnir's Ride

Entry for KVR One Synth Challenge #197 using Odin2 by TheWaveWarden

DAW: Reaper 7.27
33 VST3i: Odin2 (TheWaveWarden)
8 VST: ReaEQ (Cockos)
5 VST3: ReaComp (Cockos)
6 VST3: dearVR PRO 2 (Dear Reality)
1 VST3: Valhalla Supermassive (Valhalla DSP, LLC)
2 VST3: TDR Nova (Tokyo Dawn Labs)
1 VST3: TDR Kotelnikov (Tokyo Dawn Labs)
1 VST3: bx_masterdesk Classic (Plugin Alliance)
1 VST3: LoudMax (Thomas Mundt)
1 VST3: MAnalyzer (MeldaProduction)


Asgardian Rhapsody [OSC #197 Odin2]

Made with Synplant for OSC198 no samples just sounddesign!
DAW Reaper 7.43
Instruments:
40x VST3i: Synplant (Sonic Charge) Paid

Effects:
JS: 1175 Compressor
JS: RCInflator 2 (Oxford Edition)
VST3: BLENDEQ (AnalogObsession)
VST3: Cascade (Phonolyth) Paid
VST3: Hyperspace (JMGSound) Paid
VST3: MAnalyzer (MeldaProduction)
VST3: MCompressor (MeldaProduction)
VST3: MConvolutionEZ (MeldaProduction)
VST3: MEqualizer (MeldaProduction)
VST3: MStereoScope (MeldaProduction)
VST3: MStereoSpread (MeldaProduction) Paid
VST3: POORTEC (AnalogObsession)
VST3: kHs Transient Shaper (Kilohearts)

Johnkhf - Scaling the knife-edge ridge

Made for KVR One-Synth-Challenge 198
https://sites.google.com/site/kvrosc/2025/osc-198-any-one-synth

bzz - Hydrop(h)onic Experiments



STREAM: linktr.ee/neukatalyst

--------------

Final Placement: 7/32 (top 22%)
Made for KVR Audio's "One Synth Challenge" #199

This month, it was "RipplerX" by tilr8/tiagolr. RipplerX was the only synth used across multiple instances, including all drums. Only stock-effects and perpetually-free effects were used to process them and the master. Other usual rules apply: no samples, paid effects, or self-modulating effects.

-DAW:
FL Studio 2024

-Instances used:
14	RipplerX

-Effects, excluding FL controllers/modulators:
3	Baby Comeback
1	Crisp
2	crunchrr
3	DC1A3
3	Disperse-X (Plugdata)
1	EQUO (FL)
4	filtrr
10	Flux Mini 2
1	FP HYPE (Patcher)
2	Fruity Parametric EQ 2
1	Grindbox MK2
2	kHs Dynamics
6	kHs Gain
1	kHs Haas
1	kHs Trance Gate
2	kHs Transient Shaper
2	LePhonk
1	LoudMax
1	Magic Dice
1	ModMan (OSC-complicit modules only)
1	MONSTR
1	peakeater
2	Rift Feedback Lite
1	Soundgoodizer
10	Soundly Place it
1	Spectral Compressor
2	Trash (Lite/Free features only)
1	UltimUtility
4	ValhallaSupermassive

--------------
 
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Thanks for all your support!!


Neu KatalYst - Faranmut [KVR OSC 199: RipplerX] [Halftime-Bass]

Colonies won’t always last forever—sometimes planets revert, habitats decay, and entire worlds are left in ruins. Join us as we examine the life cycle of abandoned space settlements.

Watch my exclusive video The Fermi Paradox - Civilization Extinction Cycles: https://nebula.tv/videos/isaacarthur-the-fermi-paradox-civilization-extinction-cycles
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Grab one of our new SFIA mugs and make your morning coffee a little more futuristic — available now on our Fourthwall store! https://isaac-arthur-shop.fourthwall.com/

Visit our Website: http://www.isaacarthur.net
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Credits:
Abandoned Space Colonies - How Worlds Can Unterraform Themselves
Written, Produced & Narrated by: Isaac ArthurSelect imagery/video supplied by Getty Images 
Music Courtesy of Aerium, Stellardrone, Chris Zabriskie, and Epidemic Sound http://epidemicsound.com/creator

Chapters
0:00 Intro
4:13 Why Colonies Fail
9:31 Ecological Collapse in Non-Earth Environments
12:39 Case Study – Kaluga-4, Oxygen Depletion
14:34 Unterraforming – How a World Reverts or Mutates
16:45 Abandonment Timelines
19:08 Case Study – Proxima B
22:00 Nebula 
Restoration & Resettlement
23:43 Case Study – Valhalla
25:22 System-Level Context
29:05 Long-Term Patterns in a Galactic Civilization


Abandoned Space Colonies - How Worlds Can Unterraform Themselves

Isaac Arthur

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