Astronomy

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PBS Space Time
What Happens If A Black Hole Hits Earth?
Check Out Above The Noise: https://youtu.be/GKS3ph3G2jc Uploaded 20-12-21 Take the Space Time Fan Survey Here: https://forms.gle/wS4bj9o3rvyhfKzUA The possibility that a black hole could actually impact Earth may seem straight out of science fiction, but the reality is that microscopic primordial black holes could actually hit Earth. If one did, it wouldn't just impact like an asteroid, it'd pass straight through the entire Earth and exit the other side. Perhaps craziest of all, this may have already happened! ***** PBS Member Stations rely on viewers like you. To support your local station, go to:http://to.pbs.org/DonateSPACE ***** Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://www.pbsspacetime.com/shop Sign up for the mailing list to get episode notifications and hear special announcements! https://mailchi.mp/1a6eb8f2717d/spacetime Hosted by Matt O'Dowd Written by Matt O'Dowd Post Production by Leonardo Scholzer, Yago Ballarini, Pedro Osinski, Adriano Leal and Stephanie Faria GFX Visualizations: Ajay Manuel Directed by Andrew Kornhaber Assistant Producer: Setare Gholipour Executive Producers: Eric Brown and Andrew Kornhaber Executives in Charge (PBS): Adam Dylewski, Maribel Lopez Director of Programming (PBS): Gabrielle Ewing Spacetime is produced by Kornhaber Brown for PBS Digital Studios. This program is produced by Kornhaber Brown, which is solely responsible for its content. © 2021 PBS. All rights reserved. Check Out Wildstar2002's higher dimensional geometry channel: https://www.youtube.com/WildStar2002 End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/user/MultiDroideka Special Thanks to Our Patreon Supporters Big Bang Supporters Ben Dimock Daniel Alexiuc Nenado763 Pravin Mansukhani Peter Barrett Nils Anderson David Neumann Ari Paul Charlie Leo Koguan Sandy Wu Matthew Miller Ahmad Jodeh Alexander Tamas Morgan Hough Juan Benet Vinnie Falco Fabrice Eap Mark Rosenthal David Nicklas Henry Van Styn Quasar Supporters Alex Kern Michael Schneider Ethan Cohen Stephen Wilcox Yogi Christina Oegren Mark Heising Hank S Hypernova Supporters william bryan Andreas Athanasopoulos Justin Smith drollere Joe Moreira Marc Armstrong Scott Gorlick Nick Berard Paul Stehr-Green MuON Marketing Russell Pope Ben Delo Nicholas Newlin Scott Gray Антон Кочков John R. Slavik Mathew Donal Botkin John Pollock Edmund Fokschaner Joseph Salomone Matthew O'Connor chuck zegar Jordan Young m0nk Daniel Muzquiz Timothy McCulloch Gamma Ray Burst Supporters Terje Vold Jered D Sweeney Anatoliy Nagornyy comboy Brett Baker Jeremy Soller Jonathan Conerly Andre Stechert Ross Bohner Paul Wood Kent Durham jim bartosh Nubble Chris Navrides Scott R Calkins Carl Scaggs The Mad Mechanic Ellis Hall John H. Austin, Jr. Diana S Ben Campbell Lawrence Tholl, DVM Faraz Khan Almog Cohen Alex Edwards Ádám Kettinger MD3 Endre Pech Daniel Jennings Cameron Sampson Pratik Mukherjee Geoffrey Clarion Nate Darren Duncan Russ Creech Jeremy Reed Eric Webster David Johnston J. King Michael Barton Christopher Barron James Ramsey Justin Jermyn Mr T Andrew Mann Peter Mertz Isaac Suttell Devon Rosenthal Oliver Flanagan Bleys Goodson Robert Walter Bruce B Ismael Montecel Simon Oliphant Mirik Gogri Mark Delagasse Mark Daniel Cohen Brandon Lattin Nickolas Andrew Freeman Protius Protius Shane Calimlim Tybie Fitzhugh Robert Ilardi Eric Kiebler Craig Stonaha Martin Skans Michael Conroy Graydon Goss Frederic Simon Tonyface John Robinson A G Kevin Lee justahat Yurii Konovaliuk John Funai Cass Costello Tristan Deloche Bradley Jenkins Kyle Hofer Daniel Stříbrný Luaan AlecZero Vlad Shipulin Cody Malte Ubl King Zeckendorff Nick Virtue Scott Gossett Dan Warren Patrick Sutton John Griffith Daniel Lyons DFaulk GrowingViolet Kevin Warne Andreas Nautsch Learn more about your ad choices. Learn more about your ad choices. Visit megaphone.fm/adchoices
Today · 26 min
PBS Space Time
Does Axionic Dark Matter Fuse Galaxies Together?
PBS Member Stations rely on viewers like you. To support your local station, go to:http://to.pbs.org/DonateSPACE Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Quantum mechanics is our best theory of the fundamental nature of reality, but it's usually only distinguishable from familiar classical mechanics on the smallest scales. However, there are some fringe cases where its distinct features manifest on scales we can observe—in things like superfluids, or the interiors of collapsed stars. But it’s also possible that our entire galaxy is filled with a reverberating quantum mechanical wave that literally holds the galaxy together—and in fact explains all the dark matter that we see across the universe. And this isn’t even a fringe theory. It’s axionic dark matter. Check out the Space Time Merch Store https://www.pbsspacetime.com/shop Sign up for the mailing list to get episode notifications and hear special announcements! https://mailchi.mp/1a6eb8f2717d/spacetime Search the Entire Space Time Library Here: https://search.pbsspacetime.com/ Hosted by Matt O'Dowd Written by Taha Dawoodbhoy & Matt O'Dowd Post Production by Leonardo Scholzer, Yago Ballarini, Adriano Leal & Stephanie Faria Directed by Andrew Kornhaber Associate Producer: Bahar Gholipour Executive Producers: Eric Brown & Andrew Kornhaber Executive in Charge for PBS: Maribel Lopez Director of Programming for PBS: Gabrielle Ewing Assistant Director of Programming for PBS: John Campbell Spacetime is produced by Kornhaber Brown for PBS Digital Studios. This program is produced by Kornhaber Brown, which is solely responsible for its content. © 2023 PBS. All rights reserved. End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/user/MultiDroideka Space Time Was Made Possible In Part By: Big Bang Supporters Bryce Fort Peter Barrett David Neumann Sean Maddox Alexander Tamas Morgan Hough Juan Benet Vinnie Falco Fabrice Eap Mark Rosenthal Quasar Supporters Vivaan Vaka Glenn Sugden Alex Kern Ethan Cohen Stephen Wilcox Christina Oegren Mark Heising Hypernova Supporters Stephen Spidle Chris Webb Ivari Tölp Zachary Wilson Kenneth See Gregory Forfa Kirk Honour Joe Moreira Bradley Voorhees Marc Armstrong Scott Gorlick Paul Stehr-Green Ben Delo Scott Gray Антон Кочков Robert Ilardi John R. Slavik Donal Botkin John Pollock Edmund Fokschaner chuck zegar Jordan Young Daniel Muzquiz Gamma Ray Burst Supporters Jakub Jasinski Robin Bayley Piotr Sarnicki Matthew Oldfield Massimiliano Pala Thomas Nielson Joe Pavlovic Ryan McGaughy Chuck Lukaszewski Edward Hodapp Cole B. Combs Andrea Galvagni Jerry Thomas Nikhil Sharma Ryan Moser John Anderson David Giltinan Scott Hannum Bradley Ulis Craig Falls Kane Holbrook Ross Story teng guo Mason Dillon Matt Langford Harsh Khandhadia Thomas Tarler Susan Albee Frank Walker Matt Quinn Michael Lev Terje Vold James Trimmier Andre Stechert Paul Wood Kent Durham Ramon Nogueira Paul Suchy Ellis Hall John H. Austin, Jr. Diana S Poljar Faraz Khan Almog Cohen Alex Edwards Daniel Jennings Cameron Sampson Jeremy Reed David Johnston Michael Barton Andrew Mann Isaac Suttell Bleys Goodson Robert Walter Mark Delagasse Mark Daniel Cohen Nickolas Andrew Freeman Shane Calimlim Tybie Fitzhugh Eric Kiebler Craig Stonaha Graydon Goss Frederic Simon Dmitri McGuiness John Robinson Jim Hudson Alex Gan David Barnholdt David Neal John Funai Bradley Jenkins Vlad Shipulin Cody Brumfield Thomas Dougherty King Zeckendorff Dan Warren Patrick Sutton John Griffith Dean Faulk Learn more about your ad choices. Visit megaphone.fm/adchoices
Today · 18 min
Fakten zum Einschlafen – Das Universum
Kann eine Galaxie wie ein Sternhaufen aussehen? - Wenn der Schein trügt: Das chemische Gedächtnis verschwundener Galaxien | Fakten zum Einschlafen - Das Universum
Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode! Zwei kompakte Schwärme alter Sterne treiben im Halo einer großen Galaxie. Beide erscheinen auf Fotografien als dichte, blasse Lichtkonzentrationen mit Hunderttausenden von Sonnen. Doch das eine Gebilde könnte ein massereicher Kugelsternhaufen sein, der gemeinsam aus einer einzigen Gaswolke entstand. Das andere könnte eine Zwerggalaxie sein, die ein eigenes System aus Dunkler Materie besitzt und eine Milliarden Jahre alte Entwicklungsgeschichte in sich trägt. Ein einfaches Foto kann diese beiden Objekte nicht unterscheiden. Die Grenze zwischen den größten Sternhaufen und den kleinsten Galaxien verläuft nicht dort, wo es unsere Intuition vermuten würde. Diese Episode untersucht, wie Astronomen diese Mehrdeutigkeit auflösen, indem sie sich vom rein Sichtbaren abwenden und die verborgene Physik der Objekte untersuchen. Anhand von Sternbewegungen, der chemischen Streuung innerhalb der Sternpopulationen und den Spuren vergangener Gezeitenkräfte rekonstruieren sie die wahre Natur dieser Systeme. Dabei zeigt sich, dass manche scheinbar typischen Kugelsternhaufen, wie etwa Omega Centauri, in Wahrheit die blank gelegten Kerne ehemaliger Zwerggalaxien sein könnten. Manche Fragen klingen einfach, bis man versucht, sie zu beantworten. Mich fasziniert an diesem Thema, wie die moderne Astrophysik lernt, den trügerischen Augenschein zu hinterfragen und stattdessen nach den tiefen physikalischen Geschichten zu suchen. Es beruhigt mich auf eigentümliche Weise, dass das Universum sich nicht in einfache Schubladen pressen lässt, sondern seine wahren Geheimnisse erst denen offenbart, die genau hinschauen.
Today · 24 min
Sleepy Facts About the Universe
Are Stellar Associations Just Failed Clusters? - Stellar Associations and the Unbound Families of the Milky Way | Sleepy Facts About the Universe
Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode! When we look at a tight, bright cluster like the Pleiades, it is easy to assume that this is how all stars are born: as a compact family held together by gravity, aging as one. But the Pleiades is actually the exception. Most stars, including our own Sun, begin their lives in families that are already dissolving. These expanding, unbound groups are called stellar associations, and understanding them changes how we see the Milky Way. This episode explores how stars form inside vast molecular clouds and why they usually do not stay together. We look at the physics of gas removal, where the intense radiation, stellar winds, and supernovae of massive newborn stars blow away the walls of their own nursery. Without the mass of that surrounding gas to hold them together, the stars drift apart. We also examine how modern astrometry missions like Gaia let us trace these expanding structures, and how associations carve out superbubbles in the galaxy that trigger future generations of star formation. I wanted to understand why the night sky looks the way it does, and I kept returning to one question: if most stars are born together, why is our Sun so alone? Exploring stellar associations provided the answer. It is a calm look at the dynamic, dispersing families of the cosmos, and a reminder that the stars we see today are just the current state of a galaxy constantly reshaping itself.
Today · 25 min