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. 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.
	2022-11-23: How To See Black Holes By Catching Neutrinos 08:53: M77 has what we call an active galactic nucleus.
	2022-11-09: What If Humanity Is Among The First Spacefaring Civilizations? 00:56: But not a galactic empire in view. 04:42: There are a bunch of other factors that cause this peak, which we go into in our episode on galactic habitable zones. 00:56: But not a galactic empire in view. 04:42: There are a bunch of other factors that cause this peak, which we go into in our episode on galactic habitable zones.
	2022-09-21: Science of the James Webb Telescope Explained! 10:53: ... here’s an example from YouTube channel galactic hunter, who shows you how to download several images of the Carina ...
	2022-07-20: What If We Live in a Superdeterministic Universe? 18:20: ... better test for fitness to join the galactic civilization than making sure a new species is smart enough to check ...
	2022-06-30: Could We Decode Alien Physics? 00:00: ... this  stuff, we can build warp-ships   and join the galactic civilization. Of course  if we get it wrong we might blow up the ... 16:39: ...   Cessationoftime has a   beautiful vision of a galactic “humanity” in which we’ve spliced our DNA with that of the the ... 00:00: ... this  stuff, we can build warp-ships   and join the galactic civilization. Of course  if we get it wrong we might blow up the planet.  ... 16:39: ...   Cessationoftime has a   beautiful vision of a galactic “humanity” in which we’ve spliced our DNA with that of the the ... 11:52: ... books just fine. It may be  embarrassing when we warp into the galactic   civilization with our spaceship on backwards, but the important ...
	2022-06-22: Is Interstellar Travel Impossible? 03:55: This is the number one potential dealbreaker for our future as a galactic species.
	2022-06-01: What If Physics IS NOT Describing Reality? 13:31: ... history of the Milky Way, told through   the various acts of galactic cannibalism performed  by our galaxy. Let’s see what you had to ... 14:22: ... Ziak asks how galaxy interactions  affect the galactic habitable zone,   suggesting that it may be less of a  ... 13:31: ... history of the Milky Way, told through   the various acts of galactic cannibalism performed  by our galaxy. Let’s see what you had to ... 14:22: ... Ziak asks how galaxy interactions  affect the galactic habitable zone,   suggesting that it may be less of a  zone and ...
	2022-05-25: The Evolution of the Modern Milky Way Galaxy 01:09: ... giant  telescopes like those on Las Campanas,   we see galactic cannibalism everywhere. We see  moments that appear frozen on the ... 03:22: ... actually talked about this process recently  in our episode on the galactic habitable zone.   The first galaxies collapsed from very ... 04:41: ... history is sometimes called   stellar archaeology. Perhaps galactic forensics  comes is a better description - teasing out ... 05:58: ... aren’t really enough to tell if   two stars came from the same galactic snack. So Evidence item number 2: If two stars came from ... 14:38: ... responses  for the last two episodes:   the one on the galactic habitable zone and its implications for the fermi paradox, and the ... 01:09: ... giant  telescopes like those on Las Campanas,   we see galactic cannibalism everywhere. We see  moments that appear frozen on the human ... 05:58: ... their orbits. And the orientation of their orbits relative to the galactic disk. ... 04:41: ... history is sometimes called   stellar archaeology. Perhaps galactic forensics  comes is a better description - teasing out the   evidence of ... 03:22: ... actually talked about this process recently  in our episode on the galactic habitable zone.   The first galaxies collapsed from very slight  ... 14:38: ... responses  for the last two episodes:   the one on the galactic habitable zone and its implications for the fermi paradox, and the ... 03:22: ... actually talked about this process recently  in our episode on the galactic habitable zone.   The first galaxies collapsed from very slight  over-dense regions ... 05:58: ... aren’t really enough to tell if   two stars came from the same galactic snack. So Evidence item number 2: If two stars came from the   ... 11:10: ... a guitar string,   the stars oscillate up and down in the galactic  plane, making a very faint ripple through the   disk. As best ...
	2022-05-18: What If the Galactic Habitable Zone LIMITS Intelligent Life? 01:36: ... Dr. McTier is a PhD astrophysicist, and expert in what we call the galactic habitability   zone, as well as being an expert in ... 05:24: ... gues what - Moiya actually wrote her PhD thesis  on the galactic habitable zone. Moiya,   what are some of the factors that ... 06:28: ... in supernova explosions. So a big factor  in determining the galactic habitable zone   is that enough massive stars have  lived ... 08:01: ... a growing cluster that would become  the Milky Way’s bulge. As the galactic bulge grew,   it was wracked by further waves of supernovae. ... 10:48: ... don’t look promising. But right in between we find   the Galactic habitable zone. It emerged around 8  billion years ago, starting ... 13:03: ... head start of a billion years - more than  enough time to establish galactic empires.   So it sounds like we haven’t made progress  ... 08:01: ... a growing cluster that would become  the Milky Way’s bulge. As the galactic bulge grew,   it was wracked by further waves of supernovae. ... 10:48: ... as metallicity increased.  It now covers around half of the galactic disk. ... 13:03: ... head start of a billion years - more than  enough time to establish galactic empires.   So it sounds like we haven’t made progress  solving the Fermi ... 01:36: ... Dr. McTier is a PhD astrophysicist, and expert in what we call the galactic habitability   zone, as well as being an expert in folklore.  Who better to ... 05:24: ... gues what - Moiya actually wrote her PhD thesis  on the galactic habitable zone. Moiya,   what are some of the factors that make  a ... 06:28: ... in supernova explosions. So a big factor  in determining the galactic habitable zone   is that enough massive stars have  lived and died ... 10:48: ... don’t look promising. But right in between we find   the Galactic habitable zone. It emerged around 8  billion years ago, starting out as a ... 05:24: ... gues what - Moiya actually wrote her PhD thesis  on the galactic habitable zone. Moiya,   what are some of the factors that make  a region ... 10:48: ... don’t look promising. But right in between we find   the Galactic habitable zone. It emerged around 8  billion years ago, starting out as a band ... 06:28: ... in supernova explosions. So a big factor  in determining the galactic habitable zone   is that enough massive stars have  lived and died in that ... 12:04: ... by an average of a billion   years. So if our analysis of the galactic  habitable zone was supposed help explain   the Fermi Paradox ... 13:03: ... just haven’t had  time to make their presence known on the galactic   scale. We’ve talked about how it should only take a million years ...
	2022-03-08: Is the Proxima System Our Best Hope For Another Earth? 00:57: By the end of the 17th century, the star had long since slipped below the horizon of Alexandria in its galactic wanderings. 02:10: Forward another century, and a Scotsman named Robert Innes photographed the southern stars from Johannesburg to track their galactic wanderings. 16:27: ... to do with it as you wish - name it, claim lordship over it, start your galactic empire there, or just use it for weekend ... 00:57: By the end of the 17th century, the star had long since slipped below the horizon of Alexandria in its galactic wanderings. 02:10: Forward another century, and a Scotsman named Robert Innes photographed the southern stars from Johannesburg to track their galactic wanderings.
	2022-01-12: How To Simulate The Universe With DFT 15:37: Most likely the black hole was moving faster than 42 km/s - that would only be the case if it had exactly the same galactic orbit as the sun.
	2021-12-29: How to Find ALIEN Dyson Spheres 00:25: Time to update you on the hunt for galactic empires. 13:07: The search for galactic empires is expanding. 00:25: Time to update you on the hunt for galactic empires. 13:07: The search for galactic empires is expanding.
	2021-11-10: What If Our Understanding of Gravity Is Wrong? 09:53: ... acted like Newtonian mechanics on solar system scales, like MOND on galactic scales, and like regular general relativity  for gravitational ...
	2021-09-07: First Detection of Light from Behind a Black Hole 03:31: ... are mostly dark, except when a bunch of gas shows up in the galactic core - then you get this gigantic whirlpool of searing plasma screaming ...
	2021-08-10: How to Communicate Across the Quantum Multiverse 16:58: ... spiraling in that magnetic field - what we call synchrotron radiation. Galactic magnetic fields have very clear bubble-like structures that come from ...
	2021-08-03: How An Extreme New Star Could Change All Cosmology 15:55: ... effect on the orbits of stars around the galaxy. Not directly. The galactic magnetic field is very weak compared to the magnetic fields of stars, or ...
	2021-07-21: How Magnetism Shapes The Universe 08:30: These are the densest regions of those galactic disks - places where magnetic fields have confined the charged particles of the interstellar plasma. 09:38: Those supernovae may also give us the seeds of magnetic fields that can then be amplified by the galactic dynamo. 10:27: But the galactic magnetic field constrains that flow, funneling some of it into vast galactic fountains erupting from the poles. 10:39: But actually, these galactic fountains are incredibly important for building galaxies. 10:53: The other cool thing that galactic magnetic fields do is that they act as colossal particle accelerators. 11:25: Those occur deep in galactic cores near the gigantic black hole that dwells there. 11:30: ... and surrounded by a disk of gas, we have what is known as an active galactic nucleus - the most powerful of which are called ... 11:25: Those occur deep in galactic cores near the gigantic black hole that dwells there. 08:30: These are the densest regions of those galactic disks - places where magnetic fields have confined the charged particles of the interstellar plasma. 09:38: Those supernovae may also give us the seeds of magnetic fields that can then be amplified by the galactic dynamo. 10:27: But the galactic magnetic field constrains that flow, funneling some of it into vast galactic fountains erupting from the poles. 10:39: But actually, these galactic fountains are incredibly important for building galaxies. 10:27: But the galactic magnetic field constrains that flow, funneling some of it into vast galactic fountains erupting from the poles. 10:53: The other cool thing that galactic magnetic fields do is that they act as colossal particle accelerators. 10:27: But the galactic magnetic field constrains that flow, funneling some of it into vast galactic fountains erupting from the poles. 10:53: The other cool thing that galactic magnetic fields do is that they act as colossal particle accelerators. 11:30: ... and surrounded by a disk of gas, we have what is known as an active galactic nucleus - the most powerful of which are called ...
	2021-04-13: What If Dark Matter Is Just Black Holes? 08:24: ... way to search for MACHOs in our galaxy is to monitor the stars in the galactic bulge or in our neighboring galaxies to see if they fluctuate in ...
	2021-02-17: Gravitational Wave Background Discovered? 00:00: ... signals so this is probably where you want me to tell you that our galactic array of quantum star clocks has revealed gigantic gravitational waves ...
	2020-10-27: How The Penrose Singularity Theorem Predicts The End of Space Time 12:11: ... black hole by monitoring the   crazy orbits of stars in the galactic core. The work of Ghez and Genzel and other astronomers   ...
	2020-08-24: Can Future Colliders Break the Standard Model? 07:25: ... natural particle accelerators like the sun or supernovae or quasars or galactic magnetic fields, which continuously spray the earth with particles at ...
	2020-04-28: Space Time Livestream: Ask Matt Anything 00:00: ... book by far is my PhD thesis the host galaxies of radio loud active galactic nuclei I think it's only been read by the three examiner's my mother I ...
	2020-04-22: Will Wormholes Allow Fast Interstellar Travel? 16:44: ... are global. So far, Andrew, so far. As soon as we have our first galactic pandemic everyone will be very grateful that I was specific in this ...
	2020-04-14: Was the Milky Way a Quasar? 01:19: But across the Universe, there are loads of “active” galaxies - ones that harbour active galactic nuclei, or AGNs, at their centers. 01:28: In these, the supermassive black hole at the galactic core is in the process of sucking down a blazing hot vortex of gas. 10:02: ... pair of powerful jets and/or winds blast out from the Galactic Centre, and any remaining gas along the path of these outflows would be ... 10:46: But new studies are unlocking the secrets of the galactic core. 10:51: ... — including two bubble-shaped structures extending above and below the Galactic ... 12:56: ... their surprisingly large influence on the Milky Way - a not-so-inactive galactic denizen of space ... 10:02: ... pair of powerful jets and/or winds blast out from the Galactic Centre, and any remaining gas along the path of these outflows would be ... 01:28: In these, the supermassive black hole at the galactic core is in the process of sucking down a blazing hot vortex of gas. 10:46: But new studies are unlocking the secrets of the galactic core. 12:56: ... their surprisingly large influence on the Milky Way - a not-so-inactive galactic denizen of space ... 01:19: But across the Universe, there are loads of “active” galaxies - ones that harbour active galactic nuclei, or AGNs, at their centers. 10:51: ... — including two bubble-shaped structures extending above and below the Galactic plane. ...
	2020-03-24: How Black Holes Spin Space Time 00:03: ... black hole. Why? Because we can use them as futuristic power generators, galactic-scale bombs, and portals to other ...
	2020-01-27: Hacking the Nature of Reality 15:47: ... galactic nuclei come in many sizes - quasar is the name we use for the largest ...
	2020-01-13: How To Capture Black Holes 02:50: ... of times the mass of the Sun. Recently we’ve also learned that the galactic center likely also contains a swarm of perhaps tens of thousands of ... 03:34: ... together. Now binary black hole pairs surely do exist in the dense galactic center, but they may have trouble merging in such a dense environment. ... 04:08: ... is a little quasar. For the most part the supermassive black holes at galactic centers are, well, black. But occasionally gas from the surrounding ... 10:18: ... large blob on the sky, which will typically contain hundreds of active galactic nuclei and many thousands of regular galaxies. Any of those could be the ... 02:50: ... of times the mass of the Sun. Recently we’ve also learned that the galactic center likely also contains a swarm of perhaps tens of thousands of ... 03:34: ... together. Now binary black hole pairs surely do exist in the dense galactic center, but they may have trouble merging in such a dense environment. Regular ... 04:08: ... occasionally gas from the surrounding galaxy will find its way into the galactic center and form an incandescent vortex - an accretion disk - as it plummets ... 02:50: ... billions of years as massive stars formed and died in the surrounding galactic core. This has been a theoretical prediction for some time, but we’ve recently ... 04:08: ... More generally, these feeding supermassive black holes are called active galactic nuclei. ... 10:18: ... large blob on the sky, which will typically contain hundreds of active galactic nuclei and many thousands of regular galaxies. Any of those could be the source ...
	2019-12-09: The Doomsday Argument 06:07: ... in one, we’re destined to spread throughout the Milky Way and forge a galactic civilization that last a million of years across a million star system, ...
	2019-11-11: Does Life Need a Multiverse to Exist? 16:33: ... But whether or not it's the case, being a rare potential progenitor of galactic civilization, seems like such a huge responsibility that maybe we should ...
	2019-11-04: Why We Might Be Alone in the Universe 03:05: ... to have emerged and spread through our galaxy and the apparent lack of galactic ...
	2019-07-01: Thorium and the Future of Nuclear Energy 16:45: ... full blown quasars the most luminous of accreting black holes or active galactic nuclei are Typically in bowl-like elliptical galaxies. So orientation ... 16:59: ... active galactic nuclei tend to live in spiral galaxies for example Seyfert galaxies and ... 16:45: ... full blown quasars the most luminous of accreting black holes or active galactic nuclei are Typically in bowl-like elliptical galaxies. So orientation isn't as ... 16:59: ... active galactic nuclei tend to live in spiral galaxies for example Seyfert galaxies and they ...
	2019-06-17: How Black Holes Kill Galaxies 00:08: ... the mass of the Central Black Hole and the mass of the star in the galactic bulge that's the central bowl like part of a spiral galaxy or the ... 07:21: ... supply of gas but then its energy output stops new gas falling into the Galactic centre in the end you have this balancing act a feedback process the ... 00:08: ... the mass of the Central Black Hole and the mass of the star in the galactic bulge that's the central bowl like part of a spiral galaxy or the entirety of ... 07:21: ... supply of gas but then its energy output stops new gas falling into the Galactic centre in the end you have this balancing act a feedback process the more ...
	2019-04-24: No Dark Matter = Proof of Dark Matter? 00:03: ... more baryonic matter than there really is in this scheme baryons on galactic size scales should always produce the effect of dark matter dark matter ...
	2019-03-20: Is Dark Energy Getting Stronger? 16:28: That said, Virgin Orbit - a spin-off of Virgin Galactic has air-launch rocket that is expected to put satellites in orbit this year. 17:07: THis is another project of Burt Rutan - designer of the Virgin Galactic craft. 16:00: Indeed, Virgin Galactic's Spaceship-1 and Spaceship-2 crossed the boundary into space - past the higher Karman line in the case of spaceshipone.
	2019-03-13: Will You Travel to Space? 00:11: Richard Branson's Virgin Galactic isn't building rockets at all – it's building spaceships. 00:23: ... the extravagance of self-landing rockets, and other displays, Virgin Galactic achieved something that no other private space company ever ... 00:59: The attention of space nerds everywhere, long distracted by the self-landing rocket club, suddenly turned back to Virgin Galactic. 04:01: ... this one. Well that sounds noble but if you've been following Virgin Galactic at all, you'll know that its business model is to sell tickets for rides ... 08:42: You already have a couple of hundred more than that signed up to fly to space with Virgin Galactic. 00:23: ... the extravagance of self-landing rockets, and other displays, Virgin Galactic achieved something that no other private space company ever ... 00:11: Richard Branson's Virgin Galactic isn't building rockets at all – it's building spaceships.
	2019-03-06: The Impossibility of Perpetual Motion Machines 14:13: ... that galactic emission doesn't look anything like the CMB in the way it fluctuations, ...
	2018-12-06: Did Life on Earth Come from Space? 00:37: ... journey ahead to get to the nearest stars a rock traveling at the sun's galactic orbital speed of 30 km/s would take several tens of thousands of years ...
	2018-10-25: Will We Ever Find Alien Life? 03:44: Assuming any of those guys are like us at all, they'll want to expand into and alter their galactic environment. 03:52: And because they almost certainly have a head start on us of at least thousands of years, that galactic gentrification might be visible to us. 09:17: ... that seriously limits the Milky Way's production of highly visible galactic ... 03:44: Assuming any of those guys are like us at all, they'll want to expand into and alter their galactic environment. 03:52: And because they almost certainly have a head start on us of at least thousands of years, that galactic gentrification might be visible to us.
	2018-10-03: How to Detect Extra Dimensions 07:59: ... on how you tweak the theory, gravity can obey an inverse square law on galactic scales, where it's sort of coupled to the three spatial dimensions of ...
	2018-08-23: How Will the Universe End? 05:13: As dark star remnants rotate through countless galactic orbits, they interact with each other gravitationally. 05:49: Around 10 times longer still, and the entire megagalaxy will either have dispersed or fallen into the massive black hole at the galactic center. 05:13: As dark star remnants rotate through countless galactic orbits, they interact with each other gravitationally.
	2018-05-09: How Gaia Changed Astronomy Forever 02:07: Coupled with its incredible position measurements, this enables Gaia to measure distances to stars as far away as the galactic center. 04:28: The stars all move in their own orbits around the galactic core. 08:02: Gaia even helps us with the pulsar timing array, a galactic scale gravitational wave observatory which we spoke about recently. 08:40: This is our Milky Way, and we just became much more familiar with our galactic home in space time. 02:07: Coupled with its incredible position measurements, this enables Gaia to measure distances to stars as far away as the galactic center. 04:28: The stars all move in their own orbits around the galactic core. 08:02: Gaia even helps us with the pulsar timing array, a galactic scale gravitational wave observatory which we spoke about recently.
	2018-04-25: Black Hole Swarms 00:43: We know these things because we see them, from our comfortable vantage 28,000 light years out in the galactic disk. 01:28: ... already believe there must be a swarm of black holes in the galactic ... 03:25: Gradually, it falls towards the galactic center. 04:08: Because globular clusters are much more massive than a single black hole, they reach the galactic center a lot will quickly. 04:15: Over the life of the Milky Way, they have piled up in the galactic core, forming a giant nucleus star cluster. 05:56: Frequently enough that if the galactic core is full of black holes, then it should also contain quiescent X-ray binaries. 06:11: They spotted 92 point-like X-ray sources within one parsec, or around three light years, of the galactic center. 06:25: One we expect to be common in the galactic core are magnetic cataclysmic variables, also called polars. 07:42: If the sun was near the galactic core, the nearest black hole would be inside the solar systems Oort cloud. 03:25: Gradually, it falls towards the galactic center. 04:08: Because globular clusters are much more massive than a single black hole, they reach the galactic center a lot will quickly. 06:11: They spotted 92 point-like X-ray sources within one parsec, or around three light years, of the galactic center. 01:28: ... already believe there must be a swarm of black holes in the galactic core? ... 04:15: Over the life of the Milky Way, they have piled up in the galactic core, forming a giant nucleus star cluster. 05:56: Frequently enough that if the galactic core is full of black holes, then it should also contain quiescent X-ray binaries. 06:25: One we expect to be common in the galactic core are magnetic cataclysmic variables, also called polars. 07:42: If the sun was near the galactic core, the nearest black hole would be inside the solar systems Oort cloud. 04:15: Over the life of the Milky Way, they have piled up in the galactic core, forming a giant nucleus star cluster. 00:43: We know these things because we see them, from our comfortable vantage 28,000 light years out in the galactic disk.
	2018-04-18: Using Stars to See Gravitational Waves 07:52: ... it may be possible to observe this effect in the dense star fields of galactic cores if those galaxies also contain binary supermassive black holes ...
	2018-03-28: The Andromeda-Milky Way Collision 02:17: The galactic nature of Andromeda will be clear to the naked eye. 02:21: That galactic nature is also clear when we train modern telescopes on that faint smudge. 08:08: Well, for around two billion years after the initial impact, our sky will be full of a galactic train wreck as the two galaxies settle down. 02:17: The galactic nature of Andromeda will be clear to the naked eye. 02:21: That galactic nature is also clear when we train modern telescopes on that faint smudge. 08:08: Well, for around two billion years after the initial impact, our sky will be full of a galactic train wreck as the two galaxies settle down.
	2018-03-07: Should Space be Privatized? 03:36: ... Galactic teamed up with Scaled Composites to form the spaceship company, with the ... 06:07: ... SpaceShipTwo is now owned by billionaire Richard Branson's Virgin Galactic. ... 07:37: Virgin Galactic SpaceShipTwo is still forging ahead, even after the fatalities of a test flight crash and an earlier tank explosion. 03:36: ... Galactic teamed up with Scaled Composites to form the spaceship company, with the plan ...
	2018-01-31: Kronos: Devourer Of Worlds 01:49: ... of different separations, we can fine-tune our theoretical models of the galactic mass distribution, including the numbers of near-invisible stellar ...
	2017-12-20: Extinction by Gamma-Ray Burst 09:00: It orbits the Milky Way, and its galactic neighbors come and go.
	2017-10-04: When Quasars Collide STJC 02:45: When gas from the surrounding galaxy falls into and feeds the central supermassive black hole, you get an active galactic nucleus-- AGN. 07:19: And the SMBHs of these galaxies must eventually fall towards the new merged galactic core. 10:36: As such, we're renaming your personal Patreon contribution the Markarian 533 Binary Active Galactic Nucleus Fund. 07:19: And the SMBHs of these galaxies must eventually fall towards the new merged galactic core. 02:45: When gas from the surrounding galaxy falls into and feeds the central supermassive black hole, you get an active galactic nucleus-- AGN. 10:36: As such, we're renaming your personal Patreon contribution the Markarian 533 Binary Active Galactic Nucleus Fund. 02:45: When gas from the surrounding galaxy falls into and feeds the central supermassive black hole, you get an active galactic nucleus-- AGN. 10:36: As such, we're renaming your personal Patreon contribution the Markarian 533 Binary Active Galactic Nucleus Fund.
	2017-05-31: The Fate of the First Stars 02:18: Today, they're found in the galactic bulge or in globular clusters, which are ancient, dense islands of stars that orbit far out in the galactic halo.
	2017-04-19: The Oh My God Particle 00:17: Where are these extra galactic death rays coming from? 06:36: The exact sources of these so-called extra galactic cosmic rays are more mysterious. 00:17: Where are these extra galactic death rays coming from?
	2017-03-22: Superluminal Time Travel + Time Warp Challenge Answer 00:20: The reality of the vast scale of our universe, even with our galaxy, is inconvenient for tales of star-hopping adventure or warring galactic empires.
	2017-03-08: The Race to a Habitable Exoplanet - Time Warp Challenge 02:32: Eager to save the world, or perhaps to expand your own galactic holdings, you resolve to win the race.
	2017-01-25: Why Quasars are so Awesome 04:09: Now, drive gas into the galactic core. 06:21: However, the family name for any type of accreting supermassive black hole is active galactic nucleus. 06:30: This is a simplified description of our modern understanding of quasars and active galactic nuclei. 09:13: Active galactic nuclei still do fire up in the modern universe, although usually they are at full quasar power. 09:45: ... merge, the violence will deliver one last wave of fuel to the combined galactic core, and a new quasar will shine forth, illuminating this little patch ... 04:09: Now, drive gas into the galactic core. 09:45: ... merge, the violence will deliver one last wave of fuel to the combined galactic core, and a new quasar will shine forth, illuminating this little patch of ... 06:30: This is a simplified description of our modern understanding of quasars and active galactic nuclei. 09:13: Active galactic nuclei still do fire up in the modern universe, although usually they are at full quasar power. 06:21: However, the family name for any type of accreting supermassive black hole is active galactic nucleus.
	2017-01-04: How to See Black Holes + Kugelblitz Challenge Answer 02:14: But more compellingly, we've tracked the motion of stars near the galactic core for many years.
	2016-12-21: Have They Seen Us? 03:03: Surely, this is the window where aliens would choose to broadcast their messages welcoming us into the galactic community.
	2016-11-02: Quantum Vortices and Superconductivity + Drake Equation Challenge Answers 02:48: Okay, on to the answer to our Galactic Civilization Challenge Question.
	2016-10-05: Are We Alone? Galactic Civilization Challenge 06:02: Make sure you use the subject line Galactic Civilization Challenge to be in the running because we filter by subject line.
	2016-08-24: Should We Build a Dyson Sphere? 02:26: But in the end, it's just not an efficient way to start your galactic empire.
	2016-05-04: Will Starshot's Insterstellar Journey Succeed? 08:31: Perhaps a welcome to the galactic community sign?
	2016-04-13: Will the Universe Expand Forever? 11:58: Orbits aren't perfectly circular, and stars drift apart as they move in and out of the spiral arms and above and below the galactic disc.
	2016-03-30: Pulsar Starquakes Make Fast Radio Bursts? + Challenge Winners! 00:41: That tells us they're probably not from the Milky Way or they'd be mostly seen in the galactic disc.
	2015-11-18: 5 Ways to Stop a Killer Asteroid 08:53: Now this may well eliminate a number of potential galactic empires.
	2015-11-05: Why Haven't We Found Alien Life? 00:43: ... out, essentially, all advanced civilizations before they get to the galactic empire stage, whether by a nuclear war, environmental catastrophe, ...
	2015-10-15: 5 REAL Possibilities for Interstellar Travel 00:18: Why don't we see evidence of galactic empires?
	2015-06-17: How to Signal Aliens 01:48: ... transmitter built or only about 10 billion if you aimed it in the galactic plane alone, where, for reasons I can't get into here, many people think ... 05:07: So to signal aliens very far away near the galactic center, you'd still need high-powered microwaves. 01:48: ... transmitter built or only about 10 billion if you aimed it in the galactic plane alone, where, for reasons I can't get into here, many people think life ...
	2015-04-29: What's the Most Realistic Artificial Gravity in Sci-Fi? 00:35: ... plating" seems to conflict with known physics. "Star Wars," "Battlestar Galactica," "Star Trek," "Andromeda," the Ridley Scott "Alien," "Prometheus" series, ... 06:43: ... formerly at NASA, who was also the science adviser for "Battlestar Galactica" and the movie "Gravity," did the ... 00:35: ... plating" seems to conflict with known physics. "Star Wars," "Battlestar Galactica," "Star Trek," "Andromeda," the Ridley Scott "Alien," "Prometheus" series, all ...
	2015-02-25: How Do You Measure the Size of the Universe? 05:50: ... real point of Fermi paradox is that colonization on a galactic scale could happen so quickly that if life is really that common, at ...

68 result(s) shown.

Help · About · Index