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2022-06-22: Is Interstellar Travel Impossible?

  • 14:48: ... impact after we figure out what we screwed up with the first stellar ...

2022-06-01: What If Physics IS NOT Describing Reality?

  • 15:25: ... them is light years. I’ve heard  an estimate for the number of stellar collisions   that are expected to occur when the Milky Way ...

2022-05-25: The Evolution of the Modern Milky Way Galaxy

  • 04:41: ... out the Milky Way’s history is sometimes called   stellar archaeology. Perhaps galactic forensics  comes is a better ...
  • 06:57: ... because of the satellite’s incredible  ability to pinpoint stellar positions.   That enables the telescope to detect tiny ...

2022-05-18: What If the Galactic Habitable Zone LIMITS Intelligent Life?

  • 00:00: ... turns out to be utterly uninhabitable,   even for sun—like stellar systems. So is this why .. most of us .. haven’t seen ...

2022-03-08: Is the Proxima System Our Best Hope For Another Earth?

  • 00:16: But never imagined that he was gazing on a   multi-star system the stellar that  hosted a world much like the Earth.
  • 02:59: Red dwarfs are the smallest, coldest, and faintest of the stellar menagerie.

2021-12-20: What Happens If A Black Hole Hits Earth?

  • 00:29: ... to the Earth to cause trouble here. We know there are plenty of these “stellar mass” black holes wandering the galaxy that we don’t see - but the ...

2021-10-05: Why Magnetic Monopoles SHOULD Exist

  • 16:32: ... example, if a collapsing stellar core is massive enough it smashes through the degeneracy pressure that ...

2021-08-03: How An Extreme New Star Could Change All Cosmology

  • 05:01: ... to measure. The most accurate way to get distances to stars is with stellar parallax. That’s when the motion of the Earth causes a star to appear to ...
  • 10:37: ... Remember I said that there are two things that can happen when a stellar remnant exceeds the Chandrasekhar limit of 1.44 solar masses - absolute ...

2021-05-11: How To Know If It's Aliens

  • 10:35: ... was studying the flare activity of Proxima Centauri - our nearest stellar neighbor. A sharp spike of radio emission appeared at 982.002 MHz and ...

2021-03-16: The NEW Crisis in Cosmology

  • 06:22: ... by a method that’s much more reliable.   That method is stellar parallax - and it’s  about as direct a method as you can ...
  • 07:28: ... to move relative to more distant stars.   That’s stellar parallax, and our quest to measure it has been central to ...

2021-02-17: Gravitational Wave Background Discovered?

  • 00:00: ... merging for all of cosmic history and supernovae have been exploding and stellar remnants have been spinning and probably at or before the instant of the ...

2020-12-15: The Supernova At The End of Time

  • 05:49: ... degeneracy pressure could support a dead star up to a point - if that stellar remnant’s mass was too high then a new process would take ...
  • 06:24: ... that mass limit - what we now call the Chandrasekhar limit. For the stellar core left behind by an ordinary star that should be 1.44 times the mass ...
  • 06:46: Okay, let’s fast forward our story just a little bit - to the very long, boring future of a stellar remnant below the Chandrasekhar limit.
  • 09:56: Remember that the Chandresekhar limit gives the largest mass possible for a stellar remnant to be supported by this pressure.

2020-09-21: Could Life Evolve Inside Stars?

  • 07:06: Those stellar interiors might then provide the mechanism for necklaces to rapidly change and even replicate.
  • 07:13: Depending on the stellar type and region, the insides of stars can be very turbulent places.
  • 09:34: At any rate, the star should behave differently to what our stellar physics models predict.

2020-09-08: The Truth About Beauty in Physics

  • 13:45: Cognitive Failure asked a great PhD level question on stellar absorption lines.

2020-09-01: How Do We Know What Stars Are Made Of?

  • 01:05: And yet in a handful of years during the 1920s we went from no idea to having a pretty solid understanding of stellar physics.
  • 02:24: ... Jump Cannon and Henrietta Swan Leavitt - two of the greats of stellar astronomy - had come through Radcliffe College - the women’s college ...
  • 02:52: We’ll come back to Cecilia - for now let’s get to some stellar science.
  • 06:25: One of the reasons for the complexity of stellar spectra is that you don’t just get one pattern of absorption lines per element.
  • 07:19: Saha and others began to apply this theory to stellar absorption lines.
  • 10:20: ... are made of, he and others were able to develop a detailed theory of stellar ...

2020-08-17: How Stars Destroy Each Other

  • 00:57: As the zombified stellar core and still-living companion spiraled closer together.
  • 01:17: At a critical point, that surface reached the temperature and pressure of a stellar core.
  • 01:58: Romantic names, even if the stellar partnership is a disaster.
  • 02:02: Our galaxy is full of these sorts of dysfunctional stellar relationships.
  • 02:07: ... half of all stars existing in binary orbits, it’s inevitable that many stellar remnants will end up in these parasitic spirals with their ...
  • 12:12: ... early universe, and these would have different mass restrictions than stellar black ...
  • 12:21: ... which often involve black holes MORE massive than was thought normal for stellar remnants could ...

2020-05-04: How We Know The Universe is Ancient

  • 00:55: ... outside the Milky Way galaxy. This is something we explored in our STELLAR series, but it’s worth a ...
  • 11:07: ... as our understanding of stellar evolution improved, those ages came down to under 13 billion years. Now ...

2020-02-18: Does Consciousness Influence Quantum Mechanics?

  • 14:37: This is a great image - galaxies falling apart as they turned into black holes and other stellar corpses.

2020-01-13: How To Capture Black Holes

  • 01:54: ... black holes were too massive to have been formed by the collapse of stellar cores. That is if our understanding of stellar evolution is half as good ...
  • 02:50: ... center likely also contains a swarm of perhaps tens of thousands of stellar-mass black holes. These are the remnants of dead stars, typically a few to a ...
  • 04:50: ... but what does the presence of an accretion disk mean for the swarm of stellar mass black holes? The orbits of those black holes are mostly random, so ...

2019-12-17: Do Black Holes Create New Universes?

  • 07:16: ... infinite time these will eventually outnumber those produced by stars or stellar black ...
  • 08:22: This would lead to multiple branches of the cosmic genetic tree - some of which correspond to producing lots of stellar black holes.

2019-08-19: What Happened Before the Big Bang?

  • 13:29: ... those of you surprised to see me out in the real world in our recent stellar series, don't worry, they caught me again and took away my kite and I'm ...

2019-07-25: Deciphering The Vast Scale of the Universe

  • 07:10: Every dot we see is a known galaxy, it’s position, velocity, and even stellar content measured and cataloged.

2019-06-17: How Black Holes Kill Galaxies

  • 00:08: ... are moving in their random orbits within galactic bulge the so called, Stellar Velocity ...
  • 01:35: ... the galaxy they definitely aren't directly responsible for the speed of stellar orbits outside their local region Sure, Galaxies and their Black Holes ...

2019-06-06: The Alchemy of Neutron Star Collisions

  • 02:47: ... out the very time and distance of their formation a collision of ancient stellar corpses in an earlier and distant space-time okay last time we talked ...

2019-05-16: The Cosmic Dark Ages

  • 06:54: ... and luminous burn out fast and leave behind black holes. These ravenous stellar corpses found themselves in an all-you-can-eat buffet of the gas-rich ...

2019-04-24: No Dark Matter = Proof of Dark Matter?

  • 00:03: ... passing through it if it were dark compact bodies like failed stars or stellar corpses or primordial black holes then we'd see the warping of of more ...

2019-01-24: The Crisis in Cosmology

  • 03:53: ...whose distances can be figured using stellar parallax Tracking their tiny motions on the sky, as Earth orbits the Sun.

2018-11-21: 'Oumuamua Is Not Aliens

  • 10:38: It's been a million years since Oumuamua's last stellar encounter.

2018-10-25: Will We Ever Find Alien Life?

  • 05:33: A team of astronomers scoured the GAIA data looking for stars that were unusually faint for their stellar type.

2018-08-23: How Will the Universe End?

  • 02:32: ... state-- the merged Milky Way-Andromeda Galaxy comprised of nothing but stellar remnants, the ultradense neutron stars and black holes from long-extinct ...
  • 04:40: The next destructive event is that every planetary system in the galaxy will eventually be disrupted by close encounters between stellar remnants.
  • 08:38: ... themselves as they collide with each other or be captured by dense stellar remnants during the Degenerate Age and, ultimately, end up in black ...
  • 09:35: But smaller stellar remnants, ancient planets, asteroids, et cetera, could persist.

2018-08-01: How Close To The Sun Can Humanity Get?

  • 08:41: This time if our luck holds, we'll come close to touching our home star to unlock the mysteries of our closest stellar neighbor in space time.

2018-05-09: How Gaia Changed Astronomy Forever

  • 01:47: As it traverses its orbit, Gaia detects the tiny shifts in the positions of stars due to this motion, a phenomenon called stellar parallax.
  • 02:38: The combination of stellar luminosity and surface temperature has incredible diagnostic power.
  • 03:17: ... the first time, we have a complete census of the stellar population far beyond the neighborhood of the sun, compared to the HR ...
  • 04:14: The information Gaia provides will revolutionize our understanding of stellar formation and evolution.
  • 04:23: Moving on to stellar velocities, the galaxy is a dynamic place.
  • 05:16: On the large scale, we see the distribution of stellar velocities through the spiral structure of our part of the Milky Way.
  • 05:27: We can map things like stellar streams and detailed substructure that tell us about the history of our galaxies formation.
  • 06:20: We can potentially, trace the origins of these stars, allowing us to find solar systems that came from the same stellar nurseries.
  • 07:06: For example, we can study stretched out groups of stars, called stellar streams.

2018-05-02: The Star at the End of Time

  • 01:48: So let's talk stellar astrophysics.
  • 09:41: ... the Milky Way, compared to the 100,000 light years of the Milky Way stellar disk and the much smaller and denser stellar ...
  • 10:21: There certainly couldn't be millions of stellar-mass black holes.

2018-04-25: Black Hole Swarms

  • 01:56: And the densest, stellar objects, like black holes, sink to the centers of galaxies or star clusters.
  • 02:16: After blowing off their outer layers, if the remaining stellar core is massive enough, it'll collapse into a black hole.
  • 02:26: ... expect the so-called stellar-mass black holes to weigh in at between five and 15 solid amasses, although, ...
  • 03:28: Now, this process takes a really long time for a stellar-mass black hole.
  • 07:25: ... researchers extrapolate that there would need to be at least hundreds of stellar-mass black holes in the central few light years in order to get these 13 ...
  • 11:16: ... rogue wolf notes, that stellar gravitational wave detectors, like pulsar timing arrays, are a bit like ...

2018-04-18: Using Stars to See Gravitational Waves

  • 01:30: Some are trying to adjust stellar evolution models to allow for the formation of more massive black holes.
  • 01:36: ... these black holes may have grown inside globular clusters, where the stellar density is so high that we expect lots of black hole ...
  • 07:46: This generates an internal friction, heating up the stellar interior.

2018-02-28: The Trebuchet Challenge

  • 03:04: We could get into fluid or stellar dynamics, or even quantum mechanics.

2018-02-21: The Death of the Sun

  • 06:12: Earth is wreathed in the searing stellar winds.

2018-01-31: Kronos: Devourer Of Worlds

  • 00:45: So in short, essentially all stars form in these stellar nurseries.
  • 01:49: ... the galactic mass distribution, including the numbers of near-invisible stellar objects like black holes and neutron stars, as well as the distribution ...
  • 03:49: Stellar spectra are thick, with sharp emission and absorption features that result from electron transitions in atoms in the star's atmosphere.

2018-01-17: Horizon Radiation

  • 14:40: Stellar interiors are more simple and chaotic than they are complex and structured.

2018-01-10: What Do Stars Sound Like?

  • 01:13: Well, we may not see light from beneath the stellar surface, but another type of wave travels freely through stars.
  • 01:23: You see, stars have a dynamical complexity far exceeding the simplest predictions of the equations describing stellar structure.
  • 01:33: ... waves reflect around the stellar interior, setting up global oscillations, natural resonant frequencies ...
  • 01:46: And although we can't hear this resonant vibration directly, we can see its effect in the changing brightness and the motion of the stellar surface.
  • 07:52: Most stellar seismology is focused on learning about the average global structure of stars.
  • 08:56: We're only now learning to decipher the complex overlay of tones in stellar oscillations.

2017-12-20: Extinction by Gamma-Ray Burst

  • 09:04: Maybe in a few 250-million-year orbits, a stellar time bomb will wander into our vicinity.

2017-10-11: Absolute Cold

  • 09:31: ... also expect there to be a good number of stellar remnants, like neutron stars and black holes, that have fallen towards ...

2017-10-04: When Quasars Collide STJC

  • 00:15: And stellar mass black holes rip neutron stars to shreds.
  • 08:37: Can't gravitational radiation cause supermassive black holes to merge, just like it does with regular stellar mass black holes?

2017-09-20: The Future of Space Telescopes

  • 12:26: As this happens, the stellar core succumbs to the gravitational crush and collapses incredibly quickly.

2017-06-07: Supervoids vs Colliding Universes!

  • 13:29: yeme asks why the stellar populations are named backwards?
  • 13:41: ... stuck with all of these weird old measures from the past, backwards stellar populations, calling all heavy elements metals, [INAUDIBLE],, stellar ...

2017-05-31: The Fate of the First Stars

  • 01:36: Stars that formed will recently tend to have the highest metalicities, because they contain the dust of more stellar generations past.

2017-03-01: The Treasures of Trappist-1

  • 05:48: Being so close to the central star exposes the planets to stellar activity.
  • 08:14: Tidal locking, stellar activity, atmospheric composition, and volcanism can all turn an Earth-like planet uninhabitable.

2017-02-22: The Eye of Sauron Reveals a Forming Solar System!

  • 08:21: It actually has two stellar companions, making it a rare trinary star system.
  • 08:48: But we're more likely to catch loosely bound stellar systems early in their lives.

2017-02-15: Telescopes of Tomorrow

  • 01:57: Longer wavelengths of light scatter less easily than shorter wavelengths, and so have an easier time escaping these dust-packed stellar nurseries.

2017-01-25: Why Quasars are so Awesome

  • 02:56: And so the name quasi stellar radio source was born.

2016-11-16: Strange Stars

  • 00:00: ... physicists have very good reason to believe that there are even stranger stellar remnants out there, stars made entirely of ...
  • 00:44: The most wonderfully monstrous of these are the remnant corpses of the most massive stars, stellar zombies like neutron stars and black holes.
  • 01:32: Before we can understand strange stars, we need to start with a stellar remnant that we know for sure exists, the neutron star.
  • 01:44: They are created in the final collapse of a very massive stellar core after it has exhausted all possible fusion fuel supplies.

2016-10-19: The First Humans on Mars

  • 09:47: Mass is one way to identify a primordial black hole from a stellar black hole.
  • 10:54: ... quite tricky to explain how they got that big if they grew from only stellar mass black ...

2016-10-12: Black Holes from the Dawn of Time

  • 01:00: Once upon a time, the entire universe had the density of a stellar corpse.

2016-09-21: Quantum Entanglement and the Great Bohr-Einstein Debate

  • 13:43: Borne Stellar asks, do you want reapers?

2016-09-14: Self-Replicating Robots and Galactic Domination

  • 00:33: Stars for the most part act very star-like, their brightnesses and colors slavishly following the equations of stellar physics.

2016-08-10: How the Quantum Eraser Rewrites the Past

  • 11:02: The only black holes that we know for sure are buzzing around our galaxy are stellar remnant black holes.

2016-06-15: The Strange Universe of Gravitational Lensing

  • 07:20: ... stellar bodies-- black holes, neutron stars, and brown dwarves-- occasionally ...
  • 07:31: This is how we've been able to count these otherwise near-invisible stellar bodies.

2016-05-04: Will Starshot's Insterstellar Journey Succeed?

  • 09:40: Does the universe expand to such a ridiculous size that it's filled ultimately with only stellar remnants and darkness?

2016-04-27: What Does Dark Energy Really Do?

  • 11:03: Our galaxy surveys have worked for decades to measure brightnesses, redshifts, stellar compositions, and more of many millions of galaxies.

2016-04-06: We Are Star Stuff

  • 00:00: ... we are "starstuff." Most of the atoms in our body were forged in violent stellar alchemy and spread through the galaxy in past ...
  • 04:40: As well as providing us with all of their glorious entropy-resisting energy, stars are element factories, stellar alchemists.
  • 05:30: In order to liberate the products of stellar nucleosynthesis, we need to explode that star.
  • 10:24: ... KIM BOEKBINDER, "STELLAR ALCHEMIST"] In a recent episode, we talked about cosmic inflation, and ...

2016-03-30: Pulsar Starquakes Make Fast Radio Bursts? + Challenge Winners!

  • 01:11: ... contenders were various types of cataclysmic events, like colliding stellar remnants, supernovae, neutron stars collapsing into black holes, crazy ...

2016-02-11: LIGO's First Detection of Gravitational Waves!

  • 02:06: Now, LIGO is sensitive to pairs of stellar mass black holes and/or neutron stars.
  • 02:12: In both cases, these are the collapsed core of a dead star, stellar remnants.
  • 02:18: Now these stellar remnants are sometimes found in pairs, typically when the original stars were also a binary pair in orbit around each other.
  • 02:35: As a result, the stellar remnants will gradually spiral in towards each other.
  • 02:57: ... the waves produced when these stellar cores are still distant from each other are far too weak, and have too ...

2015-12-09: How to Build a Black Hole

  • 01:58: So starved of an energy source, the stellar core collapses on itself.
  • 09:44: The stellar core goes dark.
  • 10:16: The mass of the stellar core becomes the apparent mass of the black hole.

2015-10-15: 5 REAL Possibilities for Interstellar Travel

  • 07:29: There are possibilities for breaking in the stellar wind of our destination star, although that is tricky.

2015-06-17: How to Signal Aliens

  • 02:23: Nothing natural pulses with stellar brightness for a nanosecond at a time, so laser pulses would look distinctly artificial to our Vulcan friends.
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