What if the oldest aliens in the galaxy are not empires, but nomads? We explore wandering fleets, deep-time survival, and civilizations without a homeworld.

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Credits:
Nomadic Aliens – Cultures That Wander the Galaxy
Written, Produced & Narrated by: Isaac Arthur
Music Courtesy of Chris Zabriskie & Stellardrone
Select imagery/video supplied by Getty Images

Chapters
0:00 Intro
2:44 The Ship Is the World
10:49 The Nomadic Group Is Not the Species
19:15 Accretion, Not Assimilation
25:53 When Nomads Stop, and When They Refuse To
28:32 Gods & Monsters
29:32 The Oldest Civilizations May Be the Ones Still Moving

It might be our second largest and grooviest-looking planet, but Saturn is also a mini-solarsystem with 60 moons (and those crazy rings). Get a closer look at one of the most photographed and studied celestial bodies in our neighbourhood.

With NASA’s Dawn mission exploring the asteroid Vesta and dwarf planet Ceres, floating space rocks are a hot topic. Discover what’s new in the sphere of asteroids.

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Can nuclear fusion ever be practical? We explore tokamaks, plasma confinement, energy balance, and the real engineering challenges behind building a working fusion reactor—and whether fusion power will ever scale.

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Watch my exclusive video Surviving a New Ice Age: https://nebula.tv/videos/isaacarthur-surviving-a-new-ice-age
Check out Tech Altar: https://nebula.tv/techaltar?ref=isaacarthur

🛒 SFIA Merchandise: https://isaac-arthur-shop.fourthwall.com/
🌐 Visit our Website: http://www.isaacarthur.net
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Credits: The Tokamak Problem: Can We Ever Make Fusion Practical?
Written, Produced & Narrated by: Isaac Arthur
Select imagery/video supplied by Getty Images

Chapters
0:00 Intro
4:00 Why Fusion Is So Appealing
8:36 What Fusion Actually Is (and Isn’t)
10:49 The Sun Is Hot… and Also a Terrible Reactor
13:59 Quantum Tunneling: Winning by Statistics, Not Strength
17:59 Holding the Fire: The Plasma Problem
22:30 What Tokamaks Actually Solved
25:10 The Tokamak Problem, Precisely Stated
27:28 ITER and the Limits of Scaling
29:44 Tech Altar
30:44 What About Other Approaches?

A rugged sky-high plain in the heart of Bolivia, the Andean Altiplano is a natural wonder full of creatures adapted to some of Earth’s most brutal habitats. Its surreal deserts, restless volcanoes, and vast seas have remained unchanged for millennia.

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ROCKETCAM! Last week, on April 27, United Launch Alliance’s Atlas V precisely delivered 29 satellites for Amazon Leo, supporting their mission to help connect the world.

ROCKETCAM! Last week, on April 27, United Launch Alliance’s Atlas V precisely delivered 29 satellites for Amazon Leo, supporting their mission to help connect the world.

More than just a gorgeous cosmic spectacle, the northern lights reveal truths about the makeup of our planet and our sun, and they may even hint at the possibility of life on other planets.

Our understanding of the cosmos is limited not only by what we can see, but by the amount of time we have to see it. Fortunately, computer simulations are helping us see how galaxies interact over millions of years.

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Great day in the office last week.

Welcome to Virgin Galactic – The Spaceline for Earth.

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Great day in the office last week.

Welcome to Virgin Galactic – The Spaceline for Earth.

Register for updates and spaceflight reservations at https://www.virgingalactic.com/.

Get all Virgin Galactic updates:
https://www.facebook.com/VirginGalactic/
https://www.instagram.com/virgingalactic/
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https://www.linkedin.com/company/virgin-galactic/