PBS Space Time
10
2015
Documentary
, Talk
Space Time explores the outer reaches of space, the craziness of astrophysics, the possibilities of sci-fi, and anything else you can think of beyond Planet Earth with our astrophysicist host: Matthew O’Dowd.
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- Cast:
Episode 33 : How Are Quasiparticles Different From Particles?
December. 08,2022
The device you’re watching this video on is best understood by thinking about positive and negative charges moving around a circuit of diodes and transistors. But the only elementary particle actually flowing in the circuit is the negatively charged electron. And yet those flowing positive charges are there, in the form of a particle you may never have heard of.
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Episode 32 : How To See Black Holes By Catching Neutrinos
November. 23,2022
Neutrinos are one of the most bizarre of known particles. Black holes are probably the most bizarre of astrophysical objects. Makes sense we should use one to study the other, no? Well, today we’re doing just that.
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Episode 31 : Are there Undiscovered Elements Beyond The Periodic Table?
November. 16,2022
Adamantium, bolognium, dilithium. Element Zero, Kryptonite. Mythril, Netherite, Orichalcum, Unobtanium. We love the idea of fictional elements with miraculous properties that science has yet to discover. But is it really possible that new elements exist beyond the periodic table?
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Episode 30 : What If Humanity Is Among The First Spacefaring Civilizations?
November. 09,2022
Half of the universe is filled with expansionist alien civilizations, and it’s only a matter of time before they’ll reach us. OK, that sounded a little sensationalist. But it’s also the conclusion of a recent astrophysics paper. Let’s see how they figure this, and whether we should take it seriously.
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Episode 29 : Why Did Quantum Entanglement Win the Nobel Prize in Physics?
October. 26,2022
The Nobel prize in physics is typically awarded to scientists who make sense of nature; those whose discoveries render the universe more comprehensible. But the 2022 Nobel has been awarded to three physicists who revealed that the universe is even stranger than we thought thanks to Quantum Entanglement
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Episode 28 : The Equation That Explains (Nearly) Everything!
October. 19,2022
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Episode 27 : The REAL Possibility of Mapping Alien Planets!
October. 12,2022
I’m going to tell you about the craziest proposal for an astrophysics mission that has a good chance of actually happening. A train of spacecraft sailing the sun’s light to a magical point out there in space where the Sun’s own gravity turns it into a gigantic lens. What could such a solar-system-sized telescope do? Pretty much anything. But definitely map the surfaces of alien worlds.
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Episode 26 : Why Is 1/137 One of the Greatest Unsolved Problems In Physics?
September. 28,2022
The Fine Structure Constant is one the strangest numbers in all of physics. It’s the job of physicists to worry about numbers, but there’s one number that physicists have stressed about more than any other. That number is 0.00729735256 - approximately 1/137. This is the fine structure constant, and it appears everywhere in our equations of quantum physics, and we’re still trying to figure out why.
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Episode 25 : Science of the James Webb Telescope Explained!
September. 21,2022
You’ve probably heard about the James Webb Space Telescope and seen some cool pictures. But why should astronomers have all the fun? How do we get to use this new toy ourselves?
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Episode 23 : What Makes The Strong Force Strong?
August. 24,2022
Original Title: Why Isn’t The Nucleus Ripped Apart?
Quantum mechanics gets weirder as you go to smaller sizes and higher energies. It’s strange enough for atoms, but positively bizarre when we get to the atomic nucleus. And today we’re going nuclear, as we dive into the weird world of quantum chromodynamics and the strong force.
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Episode 22 : What If Dark Energy is a New Quantum Field?
August. 17,2022
What is Quintessence? Well we know that something is up with the way the universe is expanding - there’s some kind of anti-gravitational effect that’s causing the expansion to accelerate. We don’t know what it is - just that it competes against the inward-pulling effect of gravity. And it’s winning - it looks like the universe will expand forever, at an ever-increasing rate. We call this mysterious influence dark energy, but while we’ve talked a lot about how it behaves, we’ve never really explored what it is. So, what is dark energy, really?
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Episode 21 : What Happens Inside a Proton?
August. 03,2022
If we ever want to simulate a universe, we should probably learn to simulate even a single atomic nucleus. But it’s taken some of the most incredible ingenuity of the past half-century to figure out how that out. All so that today I can teach you how to simulate a very very small universe.
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Episode 20 : How Many States Of Matter Are There?
July. 27,2022
Let’s talk about states of matter. You know your states of matter don’t you? We have solids, liquids and gasses, and plasmas, quark-gluon plasmas, nuclear matter, bose-einstein condensates, neutronium, time crystals, and sand. Come to think of it, maybe I don’t know my states of matter. Or what a state of matter even is. Let’s see if we can figure it out.
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Episode 19 : What If We Live in a Superdeterministic Universe?
July. 20,2022
Today we’re going to try to save reality - or at least realism. However this rescue effort has a price; one that you may not be willing to pay. Your very soul, or at least your free will, is on the line.
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Episode 18 : Could We Decode Alien Physics?
June. 30,2022
How hard can it really be to decode alien physics and engineering? It’s gotta map to our own physics - I mean, we live in the same universe. We start by noticing that the alien technology seems to use good ol’ fashioned electronics, even if it is insanely complex. We know this because the particle carried by the alien circuitry looks like the electron. We decide this through a process of elimination.
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Episode 17 : Is Interstellar Travel Impossible?
June. 22,2022
Space is pretty deadly. But is it so deadly that we’re effectively imprisoned in our solar system forever? Many have said so, but a few have actually figured it out.
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Episode 16 : Have We SOLVED The Black Hole Information Paradox with Wormholes?
June. 15,2022
Black holes are very real, but are also a theoretical nightmare. It turns out that in order to make sense of their paradoxical nature, every black hole has to be thought of as a multitude of imaginary black holes, all connected by wormholes. And you thought the universe couldn’t get any weirder.
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Episode 15 : What If Physics IS NOT Describing Reality?
June. 01,2022
Neils Bohr said, “It is wrong to think that the task of physics is to find out how Nature is. Physics concerns what we can say about Nature.” Well it turns out that if we pay attention to this subtle difference, some of the most mysterious aspects of nature make a lot more sense.
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Episode 14 : The Evolution of the Modern Milky Way Galaxy
May. 25,2022
When we scan the heavens with giant telescopes we see galactic cannibalism everywhere. We see moments that appear frozen on the human timescale, but are really snapshots of the incredibly violent process of galaxy formation. This is how all galaxies are made. We can piece together a pretty good understanding of this process from countless snapshots. Looking into the distance means looking into the past, so it’s possible to stitch together a Frankenstein flip book of galaxy evolution.
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Episode 13 : What If the Galactic Habitable Zone LIMITS Intelligent Life?
May. 18,2022
Our solar system is a tiny bubble of habitability suspended in a vast universe that mostly wants to kill us. In fact, a good fraction of our own galaxy turns out to be utterly uninhabitable, even for sun—like stellar systems. Is this why .. most of us .. haven’t seen aliens?
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Episode 12 : Space DOES NOT Expand Everywhere
May. 04,2022
Space is big, and it’s getting bigger. But where does all that new space actually come from? And is it popping into existence all around you right now? Is that why the remote control is always further away than I thought?
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Episode 10 : Does the Universe Create Itself?
April. 20,2022
Imagine you’re leading a game of 20 questions and you forget the thing you chose half way through. You have to keep answering yesses and nos and hope that you think of something that’s consistent with all your previous questions before the game is done. Well it could be that’s what the entire universe is doing. I hope it thinks of something good before we run out of questions.
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Episode 9 : Could The Universe Be Inside A Black Hole?
March. 30,2022
What is inside a black hole? Inevitable crushing doom? Gateways to other universes? Weird, multidimensional libraries? If you’ve ever wanted to know then you might be in luck - Some physicists have argued that you’re inside one right now.
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Episode 8 : Where Is The Center of The Universe?
March. 23,2022
Today we’re going to ask a simple-seeming question that will lead to so pretty wacky places. The question is this: If the universe has a center, where is it?
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Episode 7 : What If Charge is NOT Fundamental?
March. 16,2022
If you've studied any physics you know that like charges repel and opposite charges attract. But why? It's as though this thing - electric charge - is as fundamental a property of an object as its mass. It just sort of ... is. Well it turns out if you dig deep enough, the fundamental-ness of charge unravels, and in many things, including mass itself, are unraveled with it.
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Episode 6 : Is the Proxima System Our Best Hope For Another Earth?
March. 08,2022
At just four light years away, Proxima Centauri is our closest solar neighbor. The recent discovery of the new exoplanet Proxima D, has reopened the discussion of whether the proxima system is our best chance at reaching another Earth. How did we discover Proxima D? How do we know what the conditions are on planets so far away? Watch the episode to learn more.
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Episode 5 : Are Cosmic Strings Cracks in the Universe?
February. 23,2022
Reality has cracks in it. Universe-spanning filaments of ancient Big Bang energy, formed from topological defects in the quantum fields, aka cosmic strings. They have subatomic thickness but prodigious mass and they lash through space at a close to the speed of light. They could be the most bizarre undiscovered entities that actually exist.
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Episode 3 : How Does Gravity Escape A Black Hole?
January. 27,2022
Fact: in a black hole, all of the mass is concentrated at the singularity at the very center. Fact: every black hole singularity is surrounded by an event horizon. Nothing can escape from within the event horizon unless it can travel faster than light. Fact: gravity travels at the speed of light. So how does a black hole manage to communicate its gravitational force to the outside universe? How does gravity escape a black hole?
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Episode 2 : How To Build The Universe in a Computer
January. 19,2022
We routinely simulate the universe on all of its scales, from planets to large fractions of the cosmos. Today we’re going to see how it’s possible to build a universe in a computer - and see whether there’s a limit to what we can simulate.
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Episode 1 : How To Simulate The Universe With DFT
January. 12,2022
If you used every particle in the observable universe to do a full quantum simulation, how big would that simulation be? At best a large molecule. That’s how insanely information dense the quantum wavefunction really is. And yet we routinely simulate systems with thousands, even millions of particles. How? By cheating. Using the ultimate compression algorithm: Density Functional Theory (DFT). Let’s learn how to cheat the universe.
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