Science & Futurism with Isaac Arthur

Today the channel has reached 100,000 subscribers and to celebrate that we'll take a look back at the channel's origins and thank some of the folks who've helped the channel grow. Our regularly scheduled episode will still appear Thursday morning.

Every year Project for Awesome runs a charity drive for many causes that viewers can vote for, with funds allocated to those which receive more votes. To vote for this video go to: http://www.projectforawesome.com/watc... This year SFIA is participating to help raise funds for the SENS Research Foundation. SENS [Strategies for Engineered Negligible Senescence] seeks to extend the length and quality of the human life. To learn more about SENS: http://www.sens.org

The Paperclip Maximizer is a thought experiment showing how even seemingly harmless commands to an artificial intelligence may make it run amok, turning every atom in the galaxy into paperclips. But perhaps this scenario is too simplistic, and less dangerous than it seems?

A Nebula Exclusive examining the pros and cons of terraforming planets versus constructing immense space habitats and artificial worlds. This episode is a companion video to our Megastructure Compendium episode, out June 9th.

In this bonus companion video for The Plan For After SETI Is Successful, we'll examine the current SETI methodologies for hunting for Extraterrestrial Intelligence, there limitations, and how they might be updated or added to.

Conformal Cyclic Cosmology is a theory by physicist Roger Penrose for how the Universe might undergo cycles of decay and expansion, resetting over aeons, and in this Nebula Exclusive we'll explain the theory and how it might be proved.

Planets under twin suns have fascinated us since we saw Luke Skywalker peer out at a sunset of binaries in Star Wars, but what would such star systems and worlds truly be like?

In this Nebula Exclusive we examine how feasible bulk transport and trade ships are in space.

Explore what science tells us about free will and consciousness in a quantum universe, including Sir Roger Penrose's theory of Orchestrated Objective Reduction.

The Moon offers vast resources to assist us in exploring and settler new worlds, but to get those resources, someone will have to mine them.

Could something in the future alter the past, so that effect came before cause? Does quantum mechanics truly allow this as often hinted?

Mining asteroids is often seen as one of the best pathways for brining humanity into space, but what will life be like for those intrepid miners who journey out into space to find their fortunes?

In the ancient past, before the first stars formed, all was darkness and the Universe was a very different place, but there may have been strange dark stars in that primordial era at the beginning of time.

Space is enormous, to cross it will requires spaceships able to reach high fractions of light speed. What options do we have under known science?

In an attempt to avoid doomsdays, some folks will flee for the hills, but at the galactic scale, could this be the answer to the Great Silence?

Sci-fi thrills us with enormous space monsters and Kaiju, but could the galaxy already be home to such leviathans?

In the ancient past, civilization arose around long rivers that took weeks to travel down, but in the future we might build civilizations around rivers that were billions of miles long on a type of Megastructure known as a Topopolis.

Crystals are not alive, but mimic life in many ways including growing. And yet, on distant alien planets, could life have grown based on crystals?

It can be hard to hear a signal 100 miles away, so what does it take to make a beacon loud enough to hear 100,000 light years away?

To watch and guard and monitor a world for millions of years, or simply to keep a single person's house running, we may use machine sentinels & assistants, but how do we ensure they do their job?

In order to succeed in space, we must be able to produce as much as possible on-site, or ‘in situ’, but what are the most critical resources to harvest and how do we do it?

We can imagine civilizations enduring for thousands or even millions of years, but if they can’t keep an accurate record of their own past for that long, can that civilization truly claim it endured all those eons?

We often contemplate superintelligent entities, and advances in AI and human mind augmentation may soon bring them about. But how big could they get? What would they think about? And might you, or I, one day become one ourselves?

The universe is beyond immense, and yet it might be nothing more than a tiny dot beside the rest of reality.

In the future we may use caretaker AI or even modified humans to care for cities, artificial habitats, ecosystems, or even whole worlds.

In the future many people will live and work in space, and in order to feed them, some may work as orbital farmers, but it may also become how we feed Earthlings too.

Many civilizations aspire to be eternal, to outlive the rivers and mountains and even the stars themselves… but even they are thinking much too short term.

What if the answer to why we don’t hear from alien civilizations is floating around us every day? Today, we’ll soar into the atmospheric mysteries that might explain the great silence of the universe.

Could humanity's relatively small size as an apex species be an outlier in the universe? In this episode, we explore the "Big Alien Theory," which suggests that most extraterrestrial civilizations are likely composed of much larger, less populous beings due to the constraints of biology, physics, and planetary resources.

Is there a limit to scientific discovery? In this episode, we explore whether humanity could reach the end of useful knowledge, the risks of unchecked advancement, and whether curiosity itself might lead us to a dangerous precipice.

Buzz Aldrin’s legacy extends far beyond his historic steps on the Moon. As a visionary engineer and space advocate, he pioneered the concept of the Aldrin Cycler, a revolutionary spacecraft trajectory that could enable safe, efficient, and cost-effective missions to Mars and beyond. In this episode, we explore how cycler spacecraft function, their potential to transform interplanetary travel, and why they remain a compelling solution for future space exploration. Join us as we celebrate the contributions of one of spaceflight’s greatest pioneers and examine the technology that could one day carry humanity to the Red Planet and beyond.

What if intelligence, even advanced intelligence, doesn’t require consciousness? Could civilizations evolve beyond awareness as we know it? In this episode, we explore the possibility of post-conscious civilizations—societies that function without subjective experience. Could such civilizations thrive?

What if the ultimate spaceship fuel was something that annihilates anything it touches? In this episode, we dive deep into antimatter propulsion—its physics, its promise, and the peril that comes with it.

From cosmic rays to solar storms, space travel is a radiation gauntlet—but water may be the simplest, smartest solution. Discover how future starships might turn their life-support systems into life-saving armor.

Everyone talks about terraforming Mars, but Venus might be the real prize. Discover the surprising ways we could cool, reshape, and colonize this hostile world.