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Why Quasars are so Awesome
PBS Space Time - S2017 - E4
When Quasars were first discovered the amount of light pouring out of such a tiny dot in space seemed impossible. A hysterical flurry of hypothesizing followed: swarms of neutron stars, alien civilizations harnessing their entire galaxy’s power, bright, fast-moving objects being ejected by our own galaxy’s core. But by the 1980’s we were converging on the most awesome explanation. It goes a little like this: Take a black hole of millions to billions times the mass of the sun. Where from? It turns out every decent-sized galaxy has one at its core. Now drive gas into the galactic core. One way this can happen is when galaxies merge and grow. That gas descends into the waiting black hole’s gravitational well and gains incredible speed on the way. It is swept up in a raging whirlpool around the black hole that we call an accretion disk, where its energy of motion is turned into heat. The heat-glow of the accretion disk is so bright that we can see quasars to the ends of the universe.
PBS Space Time: Season 2017 - 45 Episode s
2017x1 - How to See Black Holes + Kugelblitz Challenge Answer
January 4, 2017
Find out how scientists are mapping the black holes throughout the Milky Way and beyond as well as the answer to the Escape the Kugelblitz Challenge Question. Were you able to save humanity?
2017x2 - The EM Drive: Fact or Fantasy?
January 17, 2017
Because you demanded it … we break down the EM Drive!
2017x3 - The Phantom Singularity
January 19, 2017
Isaac Newton’s Universal Law of Gravitation tells us that there is a singularity to be found within a black hole, but scientists and mathematicians have found a number of issues with Newton’s equations. They don’t always accurately represent reality. Einstein’s General Theory of Relativity is a more complete theory of gravity. So does using the General Theory of Relativity eliminate the singularity? No. Not only does it concur with Newton’s Universal Law of Gravitation but it also reveals a second singularity, not at the center of the black hole but at the event horizon.
2017x4 - Why Quasars are so Awesome
January 25, 2017
When Quasars were first discovered the amount of light pouring out of such a tiny dot in space seemed impossible. A hysterical flurry of hypothesizing followed: swarms of neutron stars, alien civilizations harnessing their entire galaxy’s power, bright, fast-moving objects being ejected by our own galaxy’s core. But by the 1980’s we were converging on the most awesome explanation. It goes a little like this: Take a black hole of millions to billions times the mass of the sun. Where from? It turns out every decent-sized galaxy has one at its core. Now drive gas into the galactic core. One way this can happen is when galaxies merge and grow. That gas descends into the waiting black hole’s gravitational well and gains incredible speed on the way. It is swept up in a raging whirlpool around the black hole that we call an accretion disk, where its energy of motion is turned into heat. The heat-glow of the accretion disk is so bright that we can see quasars to the ends of the universe.
2017x5 - The Geometry of Causality
February 2, 2017
In this episode we dive deeper into the relationship between space and time and explore how we can geometrically map the causality of the universe and increase our understanding of how time and distance relate to one another.
2017x6 - Telescopes of Tomorrow
February 15, 2017
2017x7 - The Eye of Sauron Reveals a Forming Solar System!
February 22, 2017
Fomalhaut is a massive young star surrounded by a ring of dust debris that can tell us a great deal about the formation of our own solar system.
2017x8 - The Treasures of Trappist-1
March 1, 2017
Can humanity survive on one of the seven earth-like Trappist-1 planets? Last week, seven earth-like planets were discovered orbiting a Red Dwarf star 39 light years away. Each one could be capable of supporting life.
2017x9 - The Race to a Habitable Exoplanet - Time Warp Challenge
March 8, 2017
You’ve discovered a habitable exoplanet, but so has an an evil interplanetary mining corporation. Can you get to the planet before they strip it bare and leave it unsuitable for life? You’re going to need a ship, the Lorentz Transformation and the Wait Equation. Hang on, it’s going to be a bumpy ride.
2017x10 - Time Crystals!
March 15, 2017
In this episode of the Space Time Journal Club Matt discusses how two independent research teams created their own Time Crystals, a form of matter that breaks time translational symmetry and could be used in quantum computers.
2017x11 - Superluminal Time Travel + Time Warp Challenge Answer
March 22, 2017
Find out how traveling faster than light and traveling back in time are the same thing.
2017x12 - How Time Becomes Space Inside a Black Hole
March 29, 2017
Find out how time and space switch roles when we move beyond the event horizon of the black hole.
2017x13 - Telescopes on the Moon
April 5, 2017
Find out about China’s current telescope on the moon and what the future plans are for mounting larger telescopes on the lunar surface.
2017x14 - The Oh My God Particle
April 19, 2017
In 1991 a single atomic nucleus slammed into our atmosphere with the intensity of a macroscopic object. It’s been named The Oh My God Particle.
2017x15 - Are You a Boltzmann Brain?
April 26, 2017
Was an incredible drop in entropy responsible for the Big Bang? If that’s the case, this would lead us to conclude that a great many other things are possible, including the likelihood that you are a Boltzmann Brain.
2017x16 - Are We Living in an Ancestor Simulation?
May 3, 2017
Neil deGrasse Tyson sits down with Matt to discuss Ancestor Simulations. And check out Matt and Neil discussing how sure we are about our map of the universe
2017x17 - The Great American Eclipse
May 10, 2017
The first total solar eclipse in over 40 years is about to hit the United States.
2017x18 - Martian Evolution
May 17, 2017
What will become of humanity after spend a few hundred years on Mars? What will happen after a few thousand? Evolution has, and still is, shaping humanity in rather drastic ways. How long will humans stop being human and become Martian?
2017x19 - The Fate of the First Stars
May 31, 2017
Soon after the Big Bang, the first generation of monstrously large stars ignited, lit up the universe, and then died. The resulting swarms of supernova explosions enriched the universe with the first heavy elements and LOTs of black holes. They shaped everything that came after. These were the stars of Population III, and they are one of the most enduring mysteries in astrophysics.
2017x20 - Supervoids vs Colliding Universes!
June 7, 2017
If you study a map of the Cosmic Microwave Background, or CMB, you may notice a large, deep blue splotch on the lower right. This area, creatively named the Cold Spot. Is this feature a statistical fluke, the signature of vast supervoids, or even the imprint of another universe?
2017x21 - Anti-Matter and Quantum Relativity
June 21, 2017
Paul Dirac’s insights into the nature of Quantum Mechanics laid the foundation for Quantum Field Theory and predicted the existence of anti-matter.
2017x22 - The First Quantum Field Theory
June 28, 2017
Quantum mechanics is perhaps the most unintuitive theory ever devised. And yet it’s also the most successful, in terms of sheer predictive power. Simply by following the math of quantum mechanics, incredible discoveries have been made. Its wild success tells us that the mathematical description provided by quantum mechanics reflects deep truths about reality. And by far the most successful, most predictive formulation of quantum mechanics is quantum field theory. It is our best description we have of the fundamental workings of reality. And the first part of quantum field theory that was derived – quantum electrodynamics – is the most precise, most accurate of all.
2017x23 - Feynman's Infinite Quantum Paths
July 7, 2017
How to predict the path of a quantum particle. Part 3 in our Quantum Field Theory Series.
2017x24 - Solving the Impossible in Quantum Field Theory
July 12, 2017
How do you calculate infinite quantum outcomes? Feynman Diagrams.
2017x25 - The Real Star Wars
July 19, 2017
Anti-Satellite weaponry, giant X-ray lasers and kinetic impact missiles nicknamed the “Rods from God.” Find out about the history of the real star wars that have been waged over the past 50 years.
2017x26 - The Secrets of Feynman Diagrams
July 26, 2017
Unlock the secrets of Feynman Diagrams. Part 5 in our Quantum Field Theory series. And if you're submitting an answer to our challenge question email your answer by August 2nd to [email protected] with the subject line "Feynman Diagram Challenge."
2017x27 - Dark Flow
August 2, 2017
Why does the universe seem to be moving in one particular direction?
2017x28 - The One-Electron Universe
August 10, 2017
Could it be that all the electrons in the universe are simply one, single electron moving back and forth through time?
2017x29 - Extraterrestrial Superstorms
August 16, 2017
Earth has its share of monster storms, but even our most powerful hurricanes are a breeze compared to the great, planet-sized tempests of the gas giants.
2017x30 - First Detection of Life
August 24, 2017
What does life look like from space?
2017x31 - White Holes
August 30, 2017
Black holes are very well known but... What is a White Hole?
2017x32 - Neutron Stars Collide in New LIGO Signal?
September 13, 2017
LIGO may have just detected gravitational waves from the collision of two Neutron Stars.
2017x33 - The Future of Space Telescope
September 20, 2017
The mysteries of our universe seem limitless. However to unlock them, we’re going to need some incredible technologies to peer deeper and more sharply into space time.
2017x34 - Are the Fundamental Constants Changing?
September 28, 2017
The laws of physics are the same everywhere in the universe. At least we astrophysicists hope so. After all, it’s hard to unravel the complexities of distant parts of the universe if we don’t know the basic rules. But what if this is wrong? There is a hint of evidence that the fundamental constants that govern our universe may evolve over time, and even from one location to another.
2017x35 - When Quasars Collide STJC
October 4, 2017
So what happens when two Super Massive Black Holes collide? We may be about to find out, because astronomers have spotted a pair of them in a close binary orbit for the very first time.
2017x36 - Absolute Cold
October 11, 2017
Can we ever achieve absolute cold?
2017x37 - The Nature of Nothing
October 19, 2017
It turns out that "nothing" is one of the most interesting somethings in all of physics.
2017x38 - The Missing Mass Mystery
October 25, 2017
For years, astronomers have been unable to find up to half of the matter in the universe. We may just have solved this problem. Fingers crossed.
2017x39 - The Vacuum Catastrophe
November 3, 2017
If vacuum energy really does have the enormous value predicted by quantum field theory then our gently expanding, geometrically flat universe shouldn’t exist. This is the vacuum catastrophe.
2017x40 - Zero-Point Energy Demystified
November 8, 2017
Let’s talk about the mysterious zero-point energy and what it really can, and really can’t do.
2017x41 - Suicide Space Robots
November 22, 2017
Let’s take a moment to remember the selfless sacrifices made by some amazing robotic explorers. And be sure to learn more about your personal DNA story by going to 23andMe.com/spacetime and taking advantage of their special holiday offer.
2017x42 - Citizen Science + Zero-Point Challenge Answer
November 29, 2017
The future of science is you.
2017x43 - Understanding the Uncertainty Principle with Quantum Fourier Series
December 6, 2017
Sometimes intuitive, large-scale phenomena can give us incredible insights into the extremely unintuitive world of quantum mechanics.
2017x44 - The Origin of Our First Interstellar Visitor
December 13, 2017
We were recently visited by a traveler from outside our solar system. This is the first time we’ve ever seen an object that came to us from interstellar space. It's name is 'Oumuamua.
2017x45 - Extinction by Gamma-Ray Burst
December 20, 2017
Find out about the last time and the next time the Earth will be hit by a Gamma-ray Burst.
PBS Space Time: All seasons
S0: Specials
8 Episode s
S1: Season 1
1 Episode
S2015: Season 2015
43 Episode s
S2016: Season 2016
48 Episode s
S2017: Season 2017
45 Episode s
S2018: Season 2018
44 Episode s
S2019: Season 2019
40 Episode s
S2020: Season 2020
41 Episode s
S2021: Season 2021
35 Episode s
S2022: Season 2022
34 Episode s
S2023: Season 2023
33 Episode s
S2024: Season 2024
17 Episode s