Search PBS Space Time

What are you looking for?

	2022-12-14: How Can Matter Be BOTH Liquid AND Gas? 18:57: SomeRandomGuy asks What would our night sky look like if our galactic centre had a Quasar? 19:09: Quasars or “active galactic nuclei” glow from the heat energy of matter being ripped to shreds as it spirals towards a supermassive black hole. 19:37: ... distance of the center of the Milky Way and you get that a Milky Way quasar shining at the Eddington limit would be about 3 times brighter on our ... 19:09: Quasars or “active galactic nuclei” glow from the heat energy of matter being ripped to shreds as it spirals towards a supermassive black hole.
	2022-11-23: How To See Black Holes By Catching Neutrinos 08:59: The most powerful AGNs are called quasars, and shine out from across the universe.
	2022-11-16: Are there Undiscovered Elements Beyond The Periodic Table? 16:04: Today’s special shoutout goes to Glenn Sugden, who’s supporting us at the quasar level.
	2022-10-19: The Equation That Explains (Nearly) Everything! 15:40: ... very special thanks to Vivaan Gupta Vaka, who’s supporting us at the Quasar level. For those you who don’t know, quasars are the most brilliant ...
	2022-10-12: The REAL Possibility of Mapping Alien Planets! 15:45: ... and Sujasha Vaka, who are both supporting us at   the quasar level. Guys, we wanted  to show our appreciation by naming ...
	2022-07-20: What If We Live in a Superdeterministic Universe? 13:12: The same team followed up with a cosmic Bell test using rather more distant objects - quasars several billion light years away.
	2022-01-27: How Does Gravity Escape A Black Hole? 12:20: ... today’s special shoutout goes to Alex Kern who’s supporting us at the Quasar ...
	2022-01-19: How To Build The Universe in a Computer 08:45: ... codes are used to simulate  the flows of gas in galaxies and around quasars, used to simulate star and planet formation,   and even star ... 09:28: In your quasar disk   you need to simulate separately how  light travels through the hot plasma. 08:45: ... codes are used to simulate  the flows of gas in galaxies and around quasars, used to simulate star and planet formation,   and even star ...
	2021-12-20: What Happens If A Black Hole Hits Earth? 06:02: ... we “see” black holes like Cygnus X-1 or the supermassive black holes in quasars - from the radiation generated by the infalling, or accreting ...
	2021-12-10: 2021 End of Year AMA! 00:02: ... the distant objects through two parts through space i like to look at quasars that way quasars being gigantic black holes in the process of ...
	2021-11-02: Is ACTION The Most Fundamental Property in Physics? 14:57: ... keeping this show going. But today I want to give a huge shoutout to our Quasar supporter Michael Schneider. Hamilton's principle tells us that action ...
	2021-09-21: How Electron Spin Makes Matter Possible 14:58: ... to give a special thank you to Ethan Cohen who's supporting us at the quasar level. Ethan, you're about as far as I can imagine from being ... 16:27: ... says that when they were in school quasars were just discovered and there was speculation that they might be white ... 18:06: ... of the speed of light, regarding how fast gas can be blasted away from a quasar. ... 18:19: ... means I'm not wrong! But also not useful. The broad emission lines of quasars show that the gas is typically moving away from the black hole a few ... 14:58: ... to give a special thank you to Ethan Cohen who's supporting us at the quasar level. Ethan, you're about as far as I can imagine from being indistinguishable ... 16:27: ... says that when they were in school quasars were just discovered and there was speculation that they might be white ... 18:19: ... means I'm not wrong! But also not useful. The broad emission lines of quasars show that the gas is typically moving away from the black hole a few ...
	2021-09-07: First Detection of Light from Behind a Black Hole 01:54: We’ve been using the same technique for decades to understand quasars. 02:08: ... and reflects - reverberates - its way through the complex structure of a quasar. ... 02:36: We do this by watching how the spectrum of the quasar changes over time. 02:48: ... basically you watch the quasar, which is just a faint point of light on the sky, and stretch it into an ... 03:41: AKA an accretion disk, and switching on the quasar Quasars are not what you’d call stable. 05:22: But in a quasar, the gas is moving fast, and that motion shifts the wavelengths of the light as we see it. 05:40: In the case of the quasar’s emission lines, gas is moving towards us and away from us at many different speeds. 05:46: ... classic broad emission lines - perhaps the most striking feature of the quasar spectrum, and one that confused the hell out of the astronomers who ... 06:35: ... the same time, the response of the gas on the far side of the quasar is slower than the gas of near side because the far-side’s light has to ... 08:42: It turns out that all three types of motion are seen in different quasars. 09:03: It’s really, really hard to do this stuff because it takes years for big, powerful quasars to finish responding to a flare in the core. 09:18: We’ll be able to watch millions of quasars all do their thing at the same time. 03:41: AKA an accretion disk, and switching on the quasar Quasars are not what you’d call stable. 05:46: ... classic broad emission lines - perhaps the most striking feature of the quasar spectrum, and one that confused the hell out of the astronomers who first saw ... 01:54: We’ve been using the same technique for decades to understand quasars. 03:41: AKA an accretion disk, and switching on the quasar Quasars are not what you’d call stable. 05:40: In the case of the quasar’s emission lines, gas is moving towards us and away from us at many different speeds. 08:42: It turns out that all three types of motion are seen in different quasars. 09:03: It’s really, really hard to do this stuff because it takes years for big, powerful quasars to finish responding to a flare in the core. 09:18: We’ll be able to watch millions of quasars all do their thing at the same time. 05:40: In the case of the quasar’s emission lines, gas is moving towards us and away from us at many different speeds.
	2021-07-21: How Magnetism Shapes The Universe 11:30: ... as an active galactic nucleus - the most powerful of which are called quasars. ... 13:22: And today, our extra extra special shoutout goes to Stephen Wilcox who’s supporting us at the quasar level. 11:30: ... as an active galactic nucleus - the most powerful of which are called quasars. ...
	2021-03-16: The NEW Crisis in Cosmology 10:40: ... closely aligned behind a more nearby galaxy. Then, that quasar’s light travels multiple paths through   this gravitational ...
	2020-12-22: Navigating with Quantum Entanglement 12:01: And today I want to give an extra extra special thank you to Hank S, who supports us at the quasar level.
	2020-08-24: Can Future Colliders Break the Standard Model? 07:25: ... using natural particle accelerators like the sun or supernovae or quasars or galactic magnetic fields, which continuously spray the earth with ... 13:42: And today a special thankyou to Alec S-L, who’s supporting us at the quasar level. 07:25: ... using natural particle accelerators like the sun or supernovae or quasars or galactic magnetic fields, which continuously spray the earth with ...
	2020-06-30: Dissolving an Event Horizon 07:31: ... example, if there’s a disk of gas surrounding the black hole like in a quasar, then the gas only spirals inwards because angular momentum is carried ...
	2020-06-22: Building Black Holes in a Lab 00:16: ... of our galaxy, superheated disks of gas pouring into tiny spaces in quasars or X-ray binary systems. Gravitational waves that perfectly match our ...
	2020-05-27: Does Gravity Require Extra Dimensions? 13:04: ... and most especially to Christina Oegren, who’s supporting us at the quasar ...
	2020-04-14: Was the Milky Way a Quasar? 01:36: The most powerful AGNs are called quasars, and they can shine a thousand times brighter than their surrounding galaxy. 01:44: We’ve talked quasars — and what makes them so awesome — in a previous episode. 08:16: Now A full quasar might devour many millions of times the mass of the Sun over one active period, which could last for several million years. 08:25: ... energy in the form of light before it hits the black hole, which is why quasars shine so ... 09:00: Definitely not enough to turn Sag A* into a quasar. 01:36: The most powerful AGNs are called quasars, and they can shine a thousand times brighter than their surrounding galaxy. 01:44: We’ve talked quasars — and what makes them so awesome — in a previous episode. 08:25: ... energy in the form of light before it hits the black hole, which is why quasars shine so ...
	2020-03-24: How Black Holes Spin Space Time 01:01: ... we’ve witnessed the havoc they wreak on their surroundings in distant quasars and in our own galaxy, and we’ve even taken an image of a black hole ... 06:48: ... feeding - perhaps devouring a companion star or, in the case of quasars, a bunch of its host galaxy’s gas - the ISCO is expected to eventually be ... 01:01: ... we’ve witnessed the havoc they wreak on their surroundings in distant quasars and in our own galaxy, and we’ve even taken an image of a black hole ... 06:48: ... feeding - perhaps devouring a companion star or, in the case of quasars, a bunch of its host galaxy’s gas - the ISCO is expected to eventually be ...
	2020-02-11: Are Axions Dark Matter? 09:45: ... other spacey tests for axions. Magnetars - highly magnetic pulsars - and quasars may convert some of their own gamma ray output into axions - and that ...
	2020-01-27: Hacking the Nature of Reality 13:58: ... captured and then brought together in the searing hot accretion disks of quasars. ... 15:37: ... suggests that it's oxymoronic to say that “All you need is a little quasar" to catch black holes. Suggesting that there's no such thing as a little ... 15:47: ... galactic nuclei come in many sizes - quasar is the name we use for the largest and most powerful, where you can ... 15:56: ... quasars our powered by supermassive black holes a few tens of millions to 10 ... 16:10: And below the quasar range we have weaker active nuclei. 13:58: ... captured and then brought together in the searing hot accretion disks of quasars. ... 15:56: ... quasars our powered by supermassive black holes a few tens of millions to 10 ...
	2020-01-13: How To Capture Black Holes 00:00: ... but how about black holes being captured by the screaming vortex of a quasar, where they merge and grow like some monstrous version of a solar system. ... 00:24: ... we discover new things. When we figured out how to see in radio waves quasars and supernova remnants lit up the sky, When we learned to see in ... 04:08: ... accelerate the mergers of these black holes: all you need is a little quasar. For the most part the supermassive black holes at galactic centers are, ... 00:24: ... we discover new things. When we figured out how to see in radio waves quasars and supernova remnants lit up the sky, When we learned to see in ...
	2020-01-06: How To Detect a Neutrino 09:42: ... so comments will return after we find him." "Thanks to our Quasar Supporters: Mark Heising Vinnie Falco" (text): "Matt is currently lost ...
	2019-10-15: Loop Quantum Gravity Explained 14:59: We do see this effect in the light from gravitationally lensed quasars and supernovae.
	2019-08-26: How To Become an Astrophysicist + Challenge Question! 00:00: ... using the Hubble Space Telescope to help unravel the connection between quasars and galaxies As many others also found the two evolved hand-in-hand Each ...
	2019-07-25: Deciphering The Vast Scale of the Universe 07:54: Those smaller dots at the edge of our surveys are quasars. 08:16: ... see these most distant quasars, as well as the earliest galaxies or even black holes or worlds around ... 07:54: Those smaller dots at the edge of our surveys are quasars. 08:16: ... see these most distant quasars, as well as the earliest galaxies or even black holes or worlds around ...
	2019-07-01: Thorium and the Future of Nuclear Energy 15:29: ... put, Steve! That's exactly what it is Chuck Ritter's Dorf asks, whether quasar jets and a preferred direction Relative to the galaxy as a whole and how ... 16:45: ... full blown quasars the most luminous of accreting black holes or active galactic nuclei are ... 15:29: ... put, Steve! That's exactly what it is Chuck Ritter's Dorf asks, whether quasar jets and a preferred direction Relative to the galaxy as a whole and how does ... 16:45: ... full blown quasars the most luminous of accreting black holes or active galactic nuclei are ...
	2019-06-20: The Quasar from The Beginning of Time 01:50: ... one of our great surveys of the sky. Astronomers guessed the speck was a quasar - a vortex of radiant matter falling into a giant black ... 02:06: ... quasars are the most luminous objects in the universe. What was strange about ... 04:46: This is the instrument used to analyze the most distant quasar. 05:05: When the light analyzed by this machine left its quasar, it was ultraviolet. 05:12: ... how long that light has been traveling – 13.1 billion years, meaning the quasar lived when the universe was only 5% its current ... 05:35: There's a broad blank patch in the quasar's spectrum – it's a stretch of nothing that tells us a ton. 06:07: But this quasar shines out from the era of those first stars before they'd finished the job of reionization. 06:15: Much of the quasars once ultraviolet light was sucked up before it escaped the early universe. 06:21: And what about the supermassive black hole at the center of the quasar? 01:50: ... one of our great surveys of the sky. Astronomers guessed the speck was a quasar - a vortex of radiant matter falling into a giant black ... 02:06: ... by traveling many billions of years through our expanding universe. The quasar appeared to be more distant than any we had ever seen. But that doesn't mean we ... 05:12: ... how long that light has been traveling – 13.1 billion years, meaning the quasar lived when the universe was only 5% its current ... 06:07: But this quasar shines out from the era of those first stars before they'd finished the job of reionization. 02:06: ... quasars are the most luminous objects in the universe. What was strange about ... 05:35: There's a broad blank patch in the quasar's spectrum – it's a stretch of nothing that tells us a ton. 06:15: Much of the quasars once ultraviolet light was sucked up before it escaped the early universe. 05:35: There's a broad blank patch in the quasar's spectrum – it's a stretch of nothing that tells us a ton.
	2019-06-17: How Black Holes Kill Galaxies 00:08: ... as a bit of a shock they were discovered as the driving force behind Quasars where matter is heated to extreme Incandescence before it plunges into ... 04:05: ... to catch up like a puppy growing into its giant feet in fact we've seen quasars shining out from less than a Billion years after the Big bang with ... 06:33: ... different ways it can happen via Black Hole but all of them involve a Quasar switching on and blasting the crap out of the galaxy's gas rewinding a ... 07:21: ... Quasars's intense brightness and its powerful winds and jets can dump an enormous ... 10:49: ... the modern universe Giant Dead galaxies harbor fossil quasars supermassive Black Holes whose close connection to their surrounding ... 07:21: ... stars too hot and it stays puffed up as well as killing star formation quasar activity limits the Black Hole's own growth it grows relating the new supply of ... 06:33: ... different ways it can happen via Black Hole but all of them involve a Quasar switching on and blasting the crap out of the galaxy's gas rewinding a bit to the ... 00:08: ... as a bit of a shock they were discovered as the driving force behind Quasars where matter is heated to extreme Incandescence before it plunges into ... 04:05: ... to catch up like a puppy growing into its giant feet in fact we've seen quasars shining out from less than a Billion years after the Big bang with ... 07:21: ... i should still have plenty of gas there are other explanations besides quasars and Black Holes for the shut down star formation has to be a somewhat ... 10:49: ... the modern universe Giant Dead galaxies harbor fossil quasars supermassive Black Holes whose close connection to their surrounding ... 04:05: ... to catch up like a puppy growing into its giant feet in fact we've seen quasars shining out from less than a Billion years after the Big bang with masses of 10 ... 07:21: ... the peak of the quasar epoch when the most outrageously luminous quasars shone from the most ridiculously massive ... 10:49: ... the modern universe Giant Dead galaxies harbor fossil quasars supermassive Black Holes whose close connection to their surrounding galaxy is a clue ... 07:21: ... Quasars's intense brightness and its powerful winds and jets can dump an enormous ...
	2019-06-06: The Alchemy of Neutron Star Collisions 02:47: ... to use the lyman-alpha forest to map where along the line of sight to a quasar there are clouds of hydrogen gas and learn about their size and density ... 12:15: ... so little in this case from a single point of light that is that distant quasar." - Jan Pieter Cornet asks something that I hoped one of you would: "if ... 02:47: ... lot about the large-scale structure of the universe by looking at these quasars. ...
	2019-05-16: The Cosmic Dark Ages 06:39: ... But before we get to that, I want to take a moment to talk about quasars. It’s relevant, trust ... 06:51: Not that I should need a reason to talk about quasars. 07:19: ... by vortices of superheated plasma, these black holes powered the first quasars. They shone with the brightness of hundreds of trillions of Suns, yet ... 08:36: ... here’s the scenario – a quasar shines out from the epoch of reionization. Lyman-alpha photons from that ... 09:21: ... rest of the quasar’s light continues on its way towards us, but the universe keeps expanding. ... 10:10: ... is the spectrum of a quasar from the epoch of reionization. All of this light comes from the ... 10:47: ... reach us. The jagged region is the Lyman-alpha forest, where the quasar light passed through individual clouds of neutral gas, each of which cut ... 11:06: Oh, and right next to the Lyman-alpha cutoff we see a little light that made it through due to the ionized bubble around the quasar itself. 11:17: ... ionized. And the scant Lyman-alpha light that made it through due to the quasar’s ionization bubble can tell us how much neutral hydrogen was left at the ... 11:49: ... tells us when the dark ages ended, and light absorbed from the first quasars tracks the last phases of the subsequent ... 10:47: ... reach us. The jagged region is the Lyman-alpha forest, where the quasar light passed through individual clouds of neutral gas, each of which cut a ... 08:36: ... here’s the scenario – a quasar shines out from the epoch of reionization. Lyman-alpha photons from that quasar ... 06:39: ... But before we get to that, I want to take a moment to talk about quasars. It’s relevant, trust ... 06:51: Not that I should need a reason to talk about quasars. 07:19: ... by vortices of superheated plasma, these black holes powered the first quasars. They shone with the brightness of hundreds of trillions of Suns, yet ... 08:36: ... ionized a bubble spanning several million light years. By the time the quasar’s light reaches the edge of that bubble, the universe has expanded ... 09:21: ... rest of the quasar’s light continues on its way towards us, but the universe keeps expanding. ... 10:10: ... its way to us. This is the so-called Gunn-Peterson trough, seen only in quasars that are embedded in the early neutral ... 11:17: ... ionized. And the scant Lyman-alpha light that made it through due to the quasar’s ionization bubble can tell us how much neutral hydrogen was left at the ... 11:49: ... tells us when the dark ages ended, and light absorbed from the first quasars tracks the last phases of the subsequent ... 11:17: ... ionized. And the scant Lyman-alpha light that made it through due to the quasar’s ionization bubble can tell us how much neutral hydrogen was left at the time this ... 08:36: ... ionized a bubble spanning several million light years. By the time the quasar’s light reaches the edge of that bubble, the universe has expanded slightly. ... 09:21: ... rest of the quasar’s light continues on its way towards us, but the universe keeps expanding. ... 08:36: ... get shifted into the danger zone – they get completely absorbed as the quasar’s light enters this region of neutral ... 11:49: ... tells us when the dark ages ended, and light absorbed from the first quasars tracks the last phases of the subsequent ... 07:19: ... dots in our most sensitive surveys. As the light of those most distant quasars traveled to us it passed through the last remnants of neutral hydrogen left over ... 09:21: ... their atoms, there can be no lyman-alpha transitions. The rest of the quasar’s UV light continues to be shifted into lyman-alpha. But now it is mostly ...
	2019-05-09: Why Quantum Computing Requires Quantum Cryptography 16:16: That's probably around 5 times larger than the event horizon, in the case of this quasar.
	2019-04-24: No Dark Matter = Proof of Dark Matter? 00:03: ... elliptical galaxies while perhaps that elliptical galaxy once harbored a quasar its central black hole underwent a feeding frenzy that blasted enough ...
	2019-03-28: Could the Universe End by Tearing Apart Every Atom? 12:40: ... acceleration rate measured using distant quasars hints at an equation of state parameter slightly less than negative 1 ... 13:18: ... energy may be increasing in strength based on measurements of distant quasars. ... 12:40: ... acceleration rate measured using distant quasars hints at an equation of state parameter slightly less than negative 1 ... 13:18: ... energy may be increasing in strength based on measurements of distant quasars. ... 12:40: ... acceleration rate measured using distant quasars hints at an equation of state parameter slightly less than negative 1 well ...
	2019-03-20: Is Dark Energy Getting Stronger? 00:45: ... Nature Astronomy, “Cosmological constraints from the Hubble diagram of quasars at high redshifts” by Risaliti and ... 06:31: Enter the quasar. 06:41: Quasars are a black hole feeding frenzy. 07:00: We call such objects quasars. 07:03: Quasars are, at first glance, pretty crappy standard candles. 07:13: It’s very hard to distinguish between a brighter quasar that’s further away or a fainter quasar that’s closer to us. 07:20: In general quasars are a hot mess. 07:51: The new study uses the brightness X-ray corona to figure out the true energy output of quasars. 08:17: ... quasars shine in X-rays due to this process, and as you might expect, the ... 09:12: See, the ratio between the amounts of X-ray versus ultraviolet light depends on true ultraviolet energy output of the quasar. 09:40: But if you make the measurement with enough quasars then this scatter can be averaged away. 09:46: Fortunately there are a LOT of quasars out there – far more than known supernovae. 09:52: Risaliti and Lusso cobbled together around 1,600 quasars with both ultraviolent and X-ray observations. 10:25: ... basically shows the distance of the quasar that we get from the UV-to-X-ray ratio, versus the redshift, which is ... 10:42: The yellow and blue dots are our quasars – 1600 of them. 11:07: ... means the light from these quasars appears more stretched out – more redshifted on average – than it should ... 11:35: ... that could explain the extra stretching of the light from these distant quasars. ... 12:59: In fact there are alternative ideas that try to resolve the conflict between the CMB, supernova, and now the quasar results. 13:27: ... a systematic problem with the way supernova and/or quasar distances are determined, or even an issue with the cosmic microwave ... 13:36: ... there are still relatively few very distant quasars with good X-ray measurements, so maybe the random variations in the ... 13:27: ... a systematic problem with the way supernova and/or quasar distances are determined, or even an issue with the cosmic microwave background ... 00:45: ... Nature Astronomy, “Cosmological constraints from the Hubble diagram of quasars at high redshifts” by Risaliti and ... 06:41: Quasars are a black hole feeding frenzy. 07:00: We call such objects quasars. 07:03: Quasars are, at first glance, pretty crappy standard candles. 07:20: In general quasars are a hot mess. 07:51: The new study uses the brightness X-ray corona to figure out the true energy output of quasars. 08:17: ... quasars shine in X-rays due to this process, and as you might expect, the ... 09:40: But if you make the measurement with enough quasars then this scatter can be averaged away. 09:46: Fortunately there are a LOT of quasars out there – far more than known supernovae. 09:52: Risaliti and Lusso cobbled together around 1,600 quasars with both ultraviolent and X-ray observations. 10:25: ... from the UV-to-X-ray ratio, versus the redshift, which is how much the quasar’s light got stretched as it traveled the expanding ... 10:42: The yellow and blue dots are our quasars – 1600 of them. 11:07: ... means the light from these quasars appears more stretched out – more redshifted on average – than it should ... 11:35: ... that could explain the extra stretching of the light from these distant quasars. ... 13:36: ... there are still relatively few very distant quasars with good X-ray measurements, so maybe the random variations in the ... 11:07: ... means the light from these quasars appears more stretched out – more redshifted on average – than it should be ... 10:25: ... from the UV-to-X-ray ratio, versus the redshift, which is how much the quasar’s light got stretched as it traveled the expanding ... 08:17: ... quasars shine in X-rays due to this process, and as you might expect, the brighter a ...
	2018-09-20: Quantum Gravity and the Hardest Problem in Physics 12:46: ... a special huge thank you to Justin Lloyd, who's contributing at the Quasar level-- Justin, as a special thanks, we're sending you a box of ...
	2018-05-16: Noether's Theorem and The Symmetries of Reality 11:05: ... galaxies, and see more distant supernovae, monitoring more distant quasars for their ...
	2018-05-09: How Gaia Changed Astronomy Forever 07:51: Gaia has also mapped the position and brightnesses of over half a million quasars-- the cause of distant active galaxies.
	2018-04-18: Using Stars to See Gravitational Waves 01:53: Or perhaps they grew after being swept up in a quasar accretion disk.
	2018-03-28: The Andromeda-Milky Way Collision 06:29: The resulting super supermassive black hole may briefly power a new quasar as it consumes any gas that also ended up in the core.
	2018-03-07: Should Space be Privatized? 10:13: And today's extra huge thanks goes to Roman Pinchuk, who contributes at the Quasar Level.
	2017-12-06: Understanding the Uncertainty Principle with Quantum Fourier Series 13:58: ... hypothesized to be the light echo from a dead quasar that was once in that galaxy, so the cloud of gas ionized by the last ...
	2017-10-25: The Missing Mass Mystery 06:39: Absorption features in the light of distant quasars reveal this gas lurking between clusters of galaxies.
	2017-10-11: Absolute Cold 09:47: There it might trigger some quasar activity until it all gets gobbled up by the black hole.
	2017-10-04: When Quasars Collide STJC 02:19: This is what causes the quasar phenomenon. 02:39: Actually, let me say a bit more about quasars. 02:55: Quasar is the term for the most powerful AGNs, and they contain SMBHs with up to billions of Suns in mass. 06:54: The only way this is possible is with two separate black holes, each one powering its own mini quasar. 10:31: Justin, your contributions at the quasar level have been an amazing help. 10:44: We will spend it exclusively on animating black holes and quasars, and also pizza. 10:31: Justin, your contributions at the quasar level have been an amazing help. 02:19: This is what causes the quasar phenomenon. 02:39: Actually, let me say a bit more about quasars. 10:44: We will spend it exclusively on animating black holes and quasars, and also pizza.
	2017-09-28: Are the Fundamental Constants Changing? 06:34: The key to this measurement is quasars. 06:37: Remember quasars, insanely luminous maelstrom drums of superheated matter surrounding the most massive black holes in the universe? 06:48: When a quasar's light passes through giant clouds of gas on its way to us, elements in those clouds absorb photons to produce spectral lines. 06:58: By looking at many quasars, we can find absorbing clouds that existed in different past epochs of the universe. 07:18: They used the Keck telescope in Hawaii to study iron and magnesium absorption lines from clouds along the lines of sight of 143 quasars. 08:26: ... is really, really difficult. Photons from these extremely distant quasars and gas clouds are massively redshifted-- their wavelengths stretched ... 06:34: The key to this measurement is quasars. 06:37: Remember quasars, insanely luminous maelstrom drums of superheated matter surrounding the most massive black holes in the universe? 06:48: When a quasar's light passes through giant clouds of gas on its way to us, elements in those clouds absorb photons to produce spectral lines. 06:58: By looking at many quasars, we can find absorbing clouds that existed in different past epochs of the universe. 07:18: They used the Keck telescope in Hawaii to study iron and magnesium absorption lines from clouds along the lines of sight of 143 quasars. 08:26: ... is really, really difficult. Photons from these extremely distant quasars and gas clouds are massively redshifted-- their wavelengths stretched ... 06:37: Remember quasars, insanely luminous maelstrom drums of superheated matter surrounding the most massive black holes in the universe? 06:48: When a quasar's light passes through giant clouds of gas on its way to us, elements in those clouds absorb photons to produce spectral lines.
	2017-09-20: The Future of Space Telescopes 04:30: Besides Earth-like exoplanets, the starshade would also be an enormous help in studying quasars and other high-contrast phenomena. 10:42: And a very special thanks to Dean Fuqua for supporting us at the Quasar level. 04:30: Besides Earth-like exoplanets, the starshade would also be an enormous help in studying quasars and other high-contrast phenomena.
	2017-09-13: Neutron Stars Collide in New LIGO Signal? 12:16: And an extra huge thanks to Mark Rosenthal for supporting us at the quasar level.
	2017-08-30: White Holes 00:50: ... that black holes are very real with convincing evidence that quasars, x-ray binaries, even the center of our own Milky Way galaxy harbor these ...
	2017-08-16: Extraterrestrial Superstorms 11:40: And a very special thanks to quasar supporter Mars Yentur.
	2017-07-26: The Secrets of Feynman Diagrams 12:14: And a very special thanks to Mayank Mehrotra for supporting us at the quasar level.
	2017-07-07: Feynman's Infinite Quantum Paths 11:45: And a special big thanks to Max Levine for supporting us at the quasar level.
	2017-05-31: The Fate of the First Stars 09:26: Such black holes power quasars, which themselves, had a huge influence on the later evolution of our universe.
	2017-05-03: Are We Living in an Ancestor Simulation? ft. Neil deGrasse Tyson 12:48: And an extra huge thanks to Avan and Kyan Griggs for supporting us at the Quasar level.
	2017-04-19: The Oh My God Particle 06:41: But they may come from magnetic acceleration in quasars, or perhaps they're blasted out in gamma ray bursts. 07:59: But at that distance, sources like quasars and gamma ray bursts should be very obvious. 06:41: But they may come from magnetic acceleration in quasars, or perhaps they're blasted out in gamma ray bursts. 07:59: But at that distance, sources like quasars and gamma ray bursts should be very obvious.
	2017-04-05: Telescopes on the Moon 10:59: Quasars do this all the time to power their insane luminosities.
	2017-02-15: Telescopes of Tomorrow 10:57: And a specialty thank you to Jelle Slaets, who's supporting us at the Quasar Level.
	2017-02-02: The Geometry of Causality 10:58: ... Scharf's "Gravity's Engines" gets into my favorite space things of all-- quasars, and especially how important they are in the evolution of the ... 11:47: We skipped comments last week because I was at the beach, so today, we're tackling both phantom singularity and quasars. 12:58: Joan Eunice asks whether there's a spot near a quasar where a stable orbit could be created, and what would time dilation be like there? 14:02: Well, although quasar accretion disks can reach some pretty crazy temperatures, they aren't particularly dense. 15:13: "When my dad was in college, he needed one of those easy classes for credit, so he took a class on quasars and black holes in the universe. 14:02: Well, although quasar accretion disks can reach some pretty crazy temperatures, they aren't particularly dense. 10:58: ... Scharf's "Gravity's Engines" gets into my favorite space things of all-- quasars, and especially how important they are in the evolution of the ... 11:47: We skipped comments last week because I was at the beach, so today, we're tackling both phantom singularity and quasars. 15:13: "When my dad was in college, he needed one of those easy classes for credit, so he took a class on quasars and black holes in the universe.
	2017-01-25: Why Quasars are so Awesome 00:06: One of the most enigmatic of all astrophysical phenomena is the mighty quasar. 00:50: Of course, everyone knows that quasars are the most awesome of all. 01:26: Yep, quasars are clearly the most metal of all the space things. 01:36: Quasars helped shape our universe. 03:00: Later, to become quasar. 04:33: The heat glow of the accretion disk is so bright that we can see quasars to the ends of the universe. 04:56: ... up and collimated, channeled into jets that erupt from the poles of the quasar. ... 05:18: Looking down onto a bright accretion disk, we see a quasar in all of its glory. 05:34: ... if such an edge-on quasar has powerful jets, we see them blasting through the galaxy and even ... 06:30: This is a simplified description of our modern understanding of quasars and active galactic nuclei. 06:55: ... for 3C273, the nearest bright quasar, the accretion disk falls into a region less than 100,000 times smaller ... 07:16: Anything as energetic as a quasar must have had an influence on the universe. 07:21: The first quasars turned on in a very young universe that was still thick with the raw hydrogen gas produced in the Big Bang. 08:12: However, the same rich gas supplies that fueled those starbursts also gave rise to the epoch of quasars. 08:30: Accretion disks formed, and many knew quasars were born. 08:35: Each burst of quasar activity in a given galaxy probably only lasts 10 million years or so. 08:52: A few billion years after the Big Bang, when the universe was around a quarter of its current age, both starbursts and quasars started to dwindle. 09:09: We are now well out of the quasar epoch. 09:13: Active galactic nuclei still do fire up in the modern universe, although usually they are at full quasar power. 09:24: But good old 3C273 is a full blown quasar. 09:32: Although it's far away, its light comes to us from a time long after the peak of the quasar epoch. 09:45: ... deliver one last wave of fuel to the combined galactic core, and a new quasar will shine forth, illuminating this little patch of ... 11:13: And a very, very big thank you to Tambe Barsbay, who's supporting us at the quasar level. 11:18: Tambe, your own personal spacetime quasar is in the mail. 08:35: Each burst of quasar activity in a given galaxy probably only lasts 10 million years or so. 09:09: We are now well out of the quasar epoch. 09:32: Although it's far away, its light comes to us from a time long after the peak of the quasar epoch. 11:13: And a very, very big thank you to Tambe Barsbay, who's supporting us at the quasar level. 09:13: Active galactic nuclei still do fire up in the modern universe, although usually they are at full quasar power. 00:50: Of course, everyone knows that quasars are the most awesome of all. 01:26: Yep, quasars are clearly the most metal of all the space things. 01:36: Quasars helped shape our universe. 04:33: The heat glow of the accretion disk is so bright that we can see quasars to the ends of the universe. 06:30: This is a simplified description of our modern understanding of quasars and active galactic nuclei. 07:21: The first quasars turned on in a very young universe that was still thick with the raw hydrogen gas produced in the Big Bang. 08:12: However, the same rich gas supplies that fueled those starbursts also gave rise to the epoch of quasars. 08:30: Accretion disks formed, and many knew quasars were born. 08:52: A few billion years after the Big Bang, when the universe was around a quarter of its current age, both starbursts and quasars started to dwindle. 01:36: Quasars helped shape our universe. 08:52: A few billion years after the Big Bang, when the universe was around a quarter of its current age, both starbursts and quasars started to dwindle. 07:21: The first quasars turned on in a very young universe that was still thick with the raw hydrogen gas produced in the Big Bang.
	2017-01-11: The EM Drive: Fact or Fantasy? 09:29: ... to Joel Brinton for his incredibly generous Patreon sponsorship at the quasar ...
	2017-01-04: How to See Black Holes + Kugelblitz Challenge Answer 01:00: This gives us things like quasars, supermassive black holes in galaxy cores that feed on a superheated whirlpool of gas.
	2016-12-21: Have They Seen Us? 13:08: I want to give a very special shout-out to Luna IT Solutions, who are sponsoring us at the quasar level.
	2016-10-12: Black Holes from the Dawn of Time 05:27: In stars in our galaxy, in distant quasars, even in gamma ray bursts.
	2016-06-22: Planck's Constant and The Origin of Quantum Mechanics 12:15: But perfect alignment is almost impossible for something as small as a quasar. 12:19: The quasar is away slightly offset from the optical axis. 13:03: There are some cases where you see four individual quasar images connected by an Einstein ring. 13:10: That Einstein ring is actually the galaxy that hosts the quasar. 13:03: There are some cases where you see four individual quasar images connected by an Einstein ring.
	2016-06-15: The Strange Universe of Gravitational Lensing 04:51: This is the Einstein Cross, an extremely luminous distant quasar powered by a supermassive black hole feeding on its surroundings. 05:00: In fact, each of these spots is that one quasar viewed via four different paths through the universe. 05:14: To see multiple quasar images, you need a near-perfect alignment between the lensing galaxy and the quasar. 05:22: While we know of a 200,000 quasars, we only know of about 100 that are lensed this way. 05:28: The flickering of the lensed quasar images carries with it many secrets. 05:33: The quasar is a vortex of superheated matter falling into a black hole. 06:08: Also coded in this flickering is information about the heart of the quasar itself. 06:25: As those stars sweep in front of the quasars in a vortex, its different parts change in magnification to different degrees and at different times. 05:14: To see multiple quasar images, you need a near-perfect alignment between the lensing galaxy and the quasar. 05:28: The flickering of the lensed quasar images carries with it many secrets. 04:51: This is the Einstein Cross, an extremely luminous distant quasar powered by a supermassive black hole feeding on its surroundings. 05:00: In fact, each of these spots is that one quasar viewed via four different paths through the universe. 05:22: While we know of a 200,000 quasars, we only know of about 100 that are lensed this way. 06:25: As those stars sweep in front of the quasars in a vortex, its different parts change in magnification to different degrees and at different times.
	2016-03-16: Why is the Earth Round and the Milky Way Flat? 00:23: It loves building spheres like stars, planets, and moons, and disks like spiral galaxies, solar systems, and some crazy stuff like quasars. 08:20: This is not true of things like spiral galaxies, solar systems, and the whirlpools of gas around quasars. 00:23: It loves building spheres like stars, planets, and moons, and disks like spiral galaxies, solar systems, and some crazy stuff like quasars. 08:20: This is not true of things like spiral galaxies, solar systems, and the whirlpools of gas around quasars.
	2016-02-17: Planet X Discovered?? + Challenge Winners! 07:01: Quasar jets, pointing towards us, appear crazily bright.
	2015-11-05: Why Haven't We Found Alien Life? 09:48: ... past supernova explosions, but after the violence of the starburst and quasar ...
	2015-08-27: Watch THIS! (New Host + Challenge Winners) 03:34: Which quasar is the most distant object ever observed? 03:38: It's not a quasar at all.

72 result(s) shown.

Help · About · Index