Matthew O’Dowd
Self - Host
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Series SeasonSeason 2018 episodes2018
PBS Space Time
Season 2018
No season overview available.
Episodes
Each episode has its own detail page.
Episode 114 min2018-01-10
What Do Stars Sound Like?
We can now map the interiors of stars by “listening” to their harmonies as they vibrate with seismic waves.
Episode 215 min2018-01-17
Horizon Radiation
Learn about Horizon radiation and why it's essential for us to understand as we continue our journey towards the Unruh Effect and Hawking Radiation.
Episode 315 min2018-01-24
The End of the Habitable Zone
The Sun is slowly burning through its fuel. Hydrogen is fused into helium in the Sun’s core, producing energy that keeps it shining, and keeping the Earth warm and hospitable to life. But that fuel WILL run out, after which the Sun will swell into a red giant and flash-fry the Earth. But in fact that frying – well, slow-roasting – will begin much earlier. See, the Sun is getting brighter even now. This has complex, and for the most part terrible implications for life. The end of the world will come sooner than you think.
Episode 410 min2018-01-31
Kronos: Devourer Of Worlds
What happens when a star eats its planets? Find out on today’s Space Time Journal Club.
Episode 515 min2018-02-14
What is Energy?
Energy is the most powerful and useful concept in all of physics, but what exactly is it?
Episode 613 min2018-02-21
The Death of the Sun
What exactly will happen when the sun dies?
Episode 79 min2018-02-28
The Trebuchet Challenge
Do you have what it takes to calculate the awesome power of the trebuchet?
Episode 813 min2018-03-07
Should Space be Privatized?
Will the future of space exploration be guided by public or private entities? Which is better?
Episode 913 min2018-03-15
Hawking Radiation
It’s the most famous prediction of perhaps the most famous genius of our time ... Stephen Hawking's theory of Hawking Radiation
Episode 1010 min2018-03-21
Scientists Have Detected the First Stars
What do the first stars in the universe, dark matter, and superior siege engines have in common?
Episode 1113 min2018-03-28
The Andromeda-Milky Way Collision
The Andromeda galaxy is heading straight toward our own Milky Way. The two galaxies will inevitably collide. Will that be the very last night sky our solar system witnesses?
Episode 1212 min2018-04-04
The Unruh Effect
Worried about black holes? Consider this: Every time you accelerate - you generate an event horizon behind you. The more you accelerate away from it the closer it gets. Don’t worry, it can never catch up to you, but the Unruh radiation it generates sure can.
Episode 1314 min2018-04-11
Physics of Life
Our universe is prone to increasing disorder and chaos. So how did it generate the extreme complexity we see in life? Actually, the laws of physics themselves may demand it.
Episode 1413 min2018-04-18
Using Stars to See Gravitational Waves
Now that gravitational waves are definitely a thing, it’s time to think about some of the crazy things we can figure out with them. In some cases we’re going to need a gravitational wave observatory - in fact, we've already built one.
Episode 1512 min2018-04-25
Black Hole Swarms
It’s been conjectured that the center of the Milky Way is swarming with tens of thousands of black holes. And now we’ve actually seen them.
Episode 1612 min2018-05-02
The Star at the End of Time
If we, or any conscious being is around to witness the very distant future our galaxy, what will they see? How long will life persist as the stars begin to die?
Episode 1711 min2018-05-09
How Gaia Changed Astronomy Forever
The great advances in any science tend to come in sudden leaps. April 25th of 2018 marks the beginning of just such a leap for much of astronomy. In the early hours of the morning, the Gaia mission’s second data release dropped. Our understanding of our own galaxy will never be the same again.
Episode 1814 min2018-05-16
Noether's Theorem and The Symmetries of Reality
Conservation laws are among the most important tools in physics. They feel as fundamental as you can get. And yet they’re wrong - or at least they’re only right sometimes. These laws are consequences of a much deeper, more fundamental principle: Noether’s theorem.
Episode 1914 min2018-05-23
Why Quantum Information is Never Destroyed
If you have perfect knowledge of every single particle in the universe, can you use the laws of physics to rewind all the way back to the Big Bang? Is the entire history of the universe perfectly knowable? Or has information somehow lost along the way?
Episode 2015 min2018-06-13
What Survives Inside A Black Hole?
We’ve established by now that black holes are weird. The result of absolute gravitational collapse of a massive body: a point of hypothetical infinite density surrounded by an event horizon. At that horizon time is frozen and the fabric of space itself cascades inwards at the speed of light. Nothing can travel faster than light, and so nothing can escape from below the event horizon- not matter, not light, not even information.
Episode 2116 min2018-06-20
The Black Hole Information Paradox
We’ve established by now that black holes are weird. The result of absolute gravitational collapse of a massive body: a point of hypothetical infinite density surrounded by an event horizon. At that horizon time is frozen and the fabric of space itself cascades inwards at the speed of light. Nothing can travel faster than light, and so nothing can escape from below the event horizon- not matter, not light, not even information.
Episode 2212 min2018-06-27
How Asteroid Mining Will Save Earth
The days of oil may be numbered, but there’s another natural resource that’s never been touched, Asteroids.
Episode 2314 min2018-07-04
Will A New Neutrino Change The Standard Model?
Since the discovery of the Higgs boson, physicists have searched and searched for any hint of new particles. That search has been fruitless. Until, perhaps, now. Today on Space Time Journal Club we’ll look at a paper that reports a compelling hint of a new particle outside the standard model: the sterile neutrino.
Episode 2414 min2018-07-11
Quantum Invariance & The Origin of The Standard Model
In simple terms a gauge theory is one that has mathematical parameters, or “degrees of freedom” that can be changed without affecting the predictions of the theory.
Episode 2513 min2018-07-18
The Misunderstood Nature of Entropy
Entropy and the second law of thermodynamics has been credited with defining the arrow of time.
Episode 2615 min2018-07-25
Reversing Entropy with Maxwell's Demon
Can a demon defeat the 2nd Law of Thermodynamics?
Episode 2715 min2018-08-01
How Close To The Sun Can Humanity Get?
No episode overview available.
Episode 2817 min2018-08-15
Quantum Theory's Most Incredible Prediction
Let’s talk about the best evidence we have that the theories of quantum physics truly represent the underlying workings of reality.
Episode 2918 min2018-08-23
How Will the Universe End?
We live in an unusual age – the age when the stars still shine. We should count ourselves lucky – nearly all of future history will be dark. But events will still unfold in that long, cooling darkness, and civilizations may endure. So how will the universe and its far-future denizens spend eternity?
Episode 3014 min2018-08-30
Is There Life on Mars?
There is no greater hero in our search for life on mars than a little robot named Opportunity.
Episode 3113 min2018-09-05
The Black Hole Entropy Enigma
Black Holes should have no entropy, but they in fact hold most of the entropy in the universe. Let’s figure this out.
Episode 3217 min2018-09-12
How Much Information is in the Universe?
There’s quite a bit of stuff in the universe, to put it mildly.
Episode 3317 min2018-09-20
Quantum Gravity and the Hardest Problem in Physics
Between them, general relativity and quantum mechanics seem to describe all of observable reality.
Episode 3416 min2018-10-03
How to Detect Extra Dimensions
Physics seems to be telling us that it’s possible to simulate the entire universe on a computer smaller than the universe.
Episode 3516 min2018-10-10
Computing a Universe Simulation
Physics seems to be telling us that it’s possible to simulate the entire universe on a computer smaller than the universe.
Episode 3617 min2018-10-18
What are the Strings in String Theory?
Why strings? What are they made of? How did physicists even come up with this bizarre idea? And what’s all this nonsense of extra dimensions?
Episode 3718 min2018-10-25
Will We Ever Find Alien Life?
The silence of the galaxy and the resulting Fermi Paradox has perplexed us for nearly 50 years. But our most recent surveys of the Milky Way finally allow us to draw scientific conclusions about the depressingly persistent absence of aliens.
Episode 3818 min2018-10-31
Are Virtual Particles A New Layer of Reality?
Let me tell you a story about virtual particles. It may or may not be true.
Episode 3917 min2018-11-07
Why String Theory is Right
Some see string theory as the one great hope for a theory of everything – that it will unite quantum mechanics and gravity and so unify all of physics into one glorious theory.
Episode 4017 min2018-11-14
Supersymmetric Particle Found?
With the large hadron collider running out of places to look for clues to a deeper theory of physics, we need a bigger particle accelerator. We have one - the galaxy.
Episode 4118 min2018-11-21
'Oumuamua Is Not Alien
To repeat the space time maxim: it’s never aliens … until it is. So let’s talk about ‘oumuamua.
Episode 4219 min2018-12-06
Did Life on Earth Come from Space?
How did life on Earth get started? Did life on Earth originate on another planet? Either Mars, or in a distant solar system? Could Earth life have spread to have seeded life elsewhere? Let’s see what modern science has to say about the plausibility of panspermia.
Episode 4318 min2018-12-12
Quantum Physics in a Mirror Universe
When you look in mirror, and see what you think is a perfect reflection. You might be looking at universe whose laws are fundamentally different.
Episode 4419 min2018-12-20
Why String Theory is Wrong
There’s this idea that beauty is a powerful guide to truth in the mathematics of physical theory. String theory is certainly beautiful in the eyes of many physicists. Beautiful enough to pursue even if it’s wrong?
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