Summary
The search for extraterrestrial life has taken a new direction, focusing on the potential for advanced civilizations to leave detectable technological signatures in the universe. Researchers are exploring the concept of Dyson spheres—massive structures that could surround stars to harness energy. Originally proposed by physicist Freeman Dyson in 1960, the idea suggests that such civilizations might be identifiable through their unique thermal emissions, which would differ from natural celestial bodies.
Current efforts to detect these structures involve analyzing the light emitted by stars. A star surrounded by a Dyson sphere would exhibit unusual brightness patterns and temperature discrepancies when observed across different wavelengths. Despite extensive surveys, including one that examined over 200,000 stars, researchers have yet to find definitive evidence of Dyson spheres or similar megastructures. The search continues, with astronomers considering partial Dyson spheres and other energy-collecting constructs that might be more detectable than a complete shell.
The implications of discovering such structures are profound, potentially reshaping humanity's understanding of its place in the cosmos and offering insights into the future of our own technological development. As the search expands beyond individual stars to entire galaxies, scientists remain hopeful that they will one day find evidence of civilizations that have harnessed the power of their stars on a grand scale.
Show Notes
PBS Member Stations rely on viewers like you. To support your local station, go to:http://to.pbs.org/DonateSPACEUploaded 29-12-21Take the Space Time Fan Survey Here: https://forms.gle/wS4bj9o3rvyhfKzUA*****Sign Up on Patreon to get access to the Space Time Discord!https://www.patreon.com/pbsspacetimeOn our search for alien lifeforms we scan for primitive biosignatures, and wait and hope for their errant signals to happen by the Earth. But that may not be the best way. Any energy-hungry civilization more advanced than our own may leave an indisputable technological mark on the galaxy. And yes, we’re very actively searching for those also. Time to update you on the hunt for galactic empires.Check out the Space Time Merch Storehttps://www.pbsspacetime.com/shopSign up for the mailing list to get episode notifications and hear special announcements!https://mailchi.mp/1a6eb8f2717d/spacetimeHosted by Matt O'DowdWritten by Matt O'Dowd Post Production by Leonardo Scholzer, Yago Ballarini, Pedro Osinski, Adriano Leal and Stephanie FariaGFX Visualizations: Ajay ManuelDirected by: Andrew KornhaberAssistant Producer: Setare GholipourExecutive Producers: Eric Brown and Andrew KornhaberExecutives 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.End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/user/MultiDroidekaSpecial Thanks to Our Patreon SupportersBig Bang SupportersDavid TaicletBen DimockDaniel AlexiucNenado763Pravin MansukhaniPeter BarrettNils AndersonDavid NeumannCharlieLeo KoguanSandy WuMatthew MillerAhmad JodehAlexander TamasMorgan HoughJuan BenetVinnie FalcoFabrice EapMark RosenthalDavid NicklasHenry Van StynQuasar SupportersAlex KernMichael SchneiderEthan CohenStephen WilcoxYogi BChristina OegrenMark HeisingHank SHypernova Supporterswilliam bryandrollereJoe MoreiraMarc ArmstrongScott GorlickNick BerardPaul Stehr-GreenAlexander PriceMuON MarketingRussell PopeBen DeloNicholas NewlinScott GrayАнтон КочковJohn R. SlavikMathewDonal BotkinJohn PollockEdmund FokschanerJoseph Salomonechuck zegarJordan Youngm0nkDaniel MuzquizTimothy McCullochGamma Ray Burst SupportersKory KirkTerje VoldJered D SweeneyAnatoliy NagornyycomboyBrett BakerJeremy SollerJonathan ConerlyAndre StechertRoss BohnerPaul WoodKent Durhamjim bartoshNubbleChris NavridesScott R CalkinsCarl ScaggsThe Mad MechanicEllis HallJohn H. Austin, Jr.Diana SBen CampbellLawrence Tholl, DVMFaraz KhanAlmog CohenAlex EdwardsÁdám KettingerMD3Endre PechDaniel JenningsCameron SampsonPratik MukherjeeGeoffrey ClarionNateDarren DuncanRuss CreechJeremy ReedEric WebsterDavid JohnstonJ. KingMichael BartonChristopher BarronJames RamseyJustin JermynMr TAndrew MannIsaac SuttellDevon RosenthalOliver FlanaganBleys GoodsonRobert WalterBruce BIsmael MontecelSimon OliphantMirik GogriMark DelagasseMark Daniel CohenBrandon LattinNickolas Andrew FreemanRoy Frank Sproule IIIShane CalimlimTybie FitzhughRobert IlardiEric KieblerCraig StonahaMartin SkansMichael ConroyGraydon GossFrederic SimonTonyfaceJohn RobinsonA GKevin LeejustahatJohn FunaiCass CostelloTristan DelocheBradley JenkinsKyle HoferDaniel StříbrnýLuaanAlecZeroVlad ShipulinCodyMalte UblKing ZeckendorffNick VirtueScott GossettDan WarrenPatrick SuttonJohn GriffithDaniel LyonsDFaulkGrowingVioletKevin WarneAndreas Nautsch Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices
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PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE↓ More info below ↓Uploaded 18-02-20Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetimeSign up for the mailing list to get episode notifications and hear special announcements!https://tinyurl.com/yx9cusk5Check out the Space Time Merch Storehttps://pbsspacetime.com/It’s not surprising that the profound weirdness of the quantum world has inspired some outlandish explanations - nor that these have strayed into the realm of what we might call mysticism. One particularly pervasive notion is the idea that consciousness can directly influence quantum systems - and so influence reality. Today we’re going to see where this idea comes from, and whether quantum theory really supports it.Hosted by Matt O'DowdWritten by Matt O'DowdGraphics by Leonardo Scholzer and Adriano LealPost Production: Yago Ballarini, Max Willians, Pedro OsinskiDirected by: Eric Brown and Andrew KornhaberExecutive Producers: Eric Brown and Andrew KornhaberEnd Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0QThe behavior of the quantum world is beyond weird. Objects being in multiple places at once, communicating faster than light, or simultaneously experiencing multiple entire timelines ... that then talk to each other. The rules governing the tiny quantum world of atoms and photons seem alien. And yet we have a set of rules that give us incredible power in predicting the behavior of quantum system - rules encapsulated in the mathematics of quantum mechanics. Despite its stunning success, we’re now nearly a century past the foundation of quantum mechanics and physicists are still debating how to interpret its equations and the weirdness they represent.Thanks to our Patreon SupportersBig Bang SupportersAlexander TamasDavid BarnholdtDavid NicklasFabrice EapJuan BenetJustin LloydMorgan HoughQuasar SupporterChristina OegrenMark HeisingVinnie FalcoHypernova SupportersChuck ZegarDanton SpiveyDonal BotkinEdmund FokschanerHank SJohn HofmannJohn PollockJohn R. SlavikJordan YoungJoseph SalomoneJulian TyackeJustin AshMathewMatthew O'ConnorSyed AnsarTimothy McCullochGamma Ray Burst SupportersA GAdrian HatchAdrien MolyneuxAlecZeroAndreas NautschAngela PriggeBradley JenkinsBrandon labonteBrian BlanchardCraig StonahaDan WarrenDaniel LyonsDavid BethalaDFaulkDouglas CantrellEric KieblerFrederic SimonGeoffrey ShortGraydon GossGreg SmithJohn FunaiJohn RobinsonJonathan NesfederJosh ThomasKevin LeeKevin WarneKyle HoferMalte UblMichael ConroyNick VirtueNick WrightNickolas Andrew FreemanPatrick SuttonPaul RoseProtius ProtiusRobert IlardiScott GossettSean WarniahaShane CalimlimSipke SchoorstraSteve BradshawTatiana VorovchenkoTim StephaniTonyfaceTybie FitzhughYurii KonovaliukRandall Sylvia Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices
PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE↓ More info below ↓Uploaded 09-12-19Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetimeSign up for the mailing list to get episode notifications and hear special announcements!https://mailchi.mp/1a6eb8f2717d/spacetimeCheck out the Space Time Merch Storehttps://pbsspacetime.com/Since the dawn of humanity around 100 billion people have lived. How many will live in the future of our species? We might hope for a trillion times that if we colonize the galaxy. But a simple statistical argument tells us that the doom of our species is much, much closer. Hosted by Matt O'DowdWritten by Matt O'DowdGraphics by Leonardo Scholzer and Adriano LealDirected by: Andrew KornhaberExecutive Producers: Eric Brown and Andrew Kornhaber End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0QIn some recent episodes we’ve explored the anthropic principle and seen how it can be used to explain the fact that both our planet and our universe seem very finely tuned to allow the development of life. Our planet and/or universe can be rare and unlikely as long as there are enough other planets and/or universes to stack the odds in favour of our existence. We touched on both the potential power and potential misuse of this principle. Today we’re going to push our luck, and see how this controversial idea can be used to predict the physics of our universe, and also to predict the imminent demise of the human race.Special Thanks to Our Patreon SponsorsBIg BangAndrew and BrennaAlexander TamasCraig StonahaDavid BarnholdtDavid NicklasFabrice EapJohn SJuan BenetMorgan HoughQuasarMark HeisingVinnie FalcoHypernovachuck zegarDanton SpiveyDonal BotkinEdmund FokschanerHank SJohn HofmannJohn PollockJohn R. SlavikJordan YoungJoseph SalomoneJulian TyackeJustin AshMathewMatthew O'ConnorSyed AnsarGamma Ray BurstA GAdrian HatchAdrien MolyneuxAlecZeroAndreas NautschAngela PriggeBradley JenkinsBrandon labonteDan WarrenDaniel LyonsDavid BethalaDFaulkEric KieblerFrederic SimonGeoffrey ShortGraydon GossGreg SmithJames FlowersJamie FrederickJohn FunaiJohn GriffithJohn RobinsonJonathan NesfederJoseph DillmanJosh ThomasKevin LeeKevin WarneKyle HoferMalte UblMichael ConroyNick VirtueNick WrightPaul RoseRobert IlardiScott GossettSean WarniahaSipke SchoorstraSteve BradshawTatiana VorovchenkoTim StephaniTonyfaceYurii Konovaliuk Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices
Sign Up on Patreon to get access to the Space Time Discord!https://www.patreon.com/pbsspacetimeUploaded 23-06-21Entropy is surely one of the most perplexing concepts in physics. It’s variously described as a measure of a system’s disorder - or as the amount of useful work that you can get from it - or as the information hidden by the system. Despite the seeming ambiguity in its definition, many physicists hold entropy to be behind one of the most fundamental laws of physics.Entropy Explained Playlisthttps://youtube.com/playlist?list=PLsPUh22kYmNCzNFNDwxIug8q1Zz0Mj60HCheck out the Space Time Merch Storehttps://www.pbsspacetime.com/shopSign up for the mailing list to get episode notifications and hear special announcements!https://mailchi.mp/1a6eb8f2717d/spacetimeNORAD Paper:: https://web.archive.org/web/20100714011725/http://webpages.charter.net/dkessler/files/SourcesofOrbitalDebris.pdfHosted by Matt O'DowdWritten by Katherine McCormick and Matt O'Dowd Graphics by Leonardo Scholzer, Yago Ballarini, Pedro Osinski, Adriano Leal and Stephanie FariaGFX Visualizations: Katherine KorneiDirected by Andrew KornhaberAssistant Producer: Setare GholipourExecutive Producers: Eric Brown and Andrew KornhaberEnd Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0QSpecial thanks to Our Patreon Supporters Big Bang SupportersCharlieMrs. Tiffany PoindexterLeo KoguanSandy WuMatthew MillerScott GrayAhmad JodehRadu NegulescuAlexander TamasMorgan HoughJuan BenetVinnie FalcoFabrice EapMark RosenthalDavid Nicklas Quasar SupportersEthan CohenStephen WilcoxChristina OegrenMark HeisingHank S Hypernova Supporterswilliam bryanMarc ArmstrongScott GorlickNick BerardPaul Stehr-GreenAdam WaltersRussell PopeBen DeloL. Wayne AusbrooksNicholas NewlinDrJYouАнтон КочковJohn R. SlavikMathewDanton SpiveyDonal BotkinJohn PollockEdmund FokschanerJoseph SalomoneMatthew O'Connorchuck zegarJordan Youngm0nkJulien DuboisJohn HofmannDaniel MuzquizTimothy McCulloch Gamma Ray Burst SupportersJim BartoshNubbleChris NavridesScott R CalkinsCarl ScaggsG MackThe Mad MechanicEllis HallJohn H. Austin, Jr.Diana SBen CampbellLawrence Tholl, DVMFaraz KhanAlmog CohenAlex EdwardsÁdám KettingerMD3Endre PechDaniel JenningsCameron SampsonPratik MukherjeeGeoffrey ClarionNateAdrian PosorDarren DuncanRuss CreechJeremy ReedDerek DavisEric WebsterSteven SartoreDavid JohnstonJ. KingMichael BartonChristopher BarronJames RamseyDrew HartJustin JermynMr TAndrew MannJeremiah JohnsonPeter MertzKevin O'ConnellIsaac SuttellDevon RosenthalOliver FlanaganBleys GoodsonDarryl J LyleRobert WalterBruce BIsmael MontecelSimon OliphantMirik GogriMark Daniel CohenBrandon LattinNickolas Andrew FreemanShane CalimlimTybie FitzhughRobert IlardiAstaurusEric KieblerCraig StonahaMartin SkansMichael ConroyGraydon GossFrederic SimonTonyfaceJohn RobinsonA GKevin LeeAdrian HatchYurii KonovaliukJohn FunaiCass CostelloTristan DelocheBradley JenkinsKyle HoferDaniel StříbrnýLuaanAlecZeroVlad ShipulinCodyMalte UblKing ZeckendorffNick VirtueScott GossettDan WarrenPatrick SuttonJohn GriffithDaniel LyonsDFaulkGrowingVioletKevin WarneAndreas NautschBrandon labonte Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices
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Thanks to Brilliant for supporting PBS. Learn more at: https://brilliant.org/spacetime Uploaded 17-12-19PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACEWhat if every single black hole that formed in our universe sparked the big bang of a new universe? Cosmological natural selection proposes exactly this - but even better, it claims to be able to test the hypothesis.Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetimeSign up for the mailing list to get episode notifications and hear special announcements!https://mailchi.mp/1a6eb8f2717d/spacetimeCheck out the Space Time Merch Storehttps://pbsspacetime.com/Physicists have been struggling for some time to figure out why our universe is so comfy. Why, for example, are the fundamental constants - like the mass of the electron or the strength of the forces - just right for the emergence of life? Tweak them too much and life, stars, galaxies, the universe as we know it wouldn’t exist. In recent episodes we explored one possible explanation for this - the anthropic principle and the idea of the multiverse. If there are countless universes with different fundamental constants, then it’s not surprising that a few exist with the right numbers for life - and certainly not surprising that we find ourselves in one of those good ones. But if you don’t like the anthropic principle - and many scientists don’t - then rest assured, there’s an alternative. You only need to accept two things: that our universe formed inside a black hole, and that universes can evolve.Hosted by Matt O'DowdWritten by Matt O'DowdGraphics by Leonardo Scholzer and Adriano LealDirected by: Andrew KornhaberExecutive Producers: Eric Brown and Andrew KornhaberEnd Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0QSpecial Thanks to our Patreon Sponsors: Big BangAndrew and BrennaAlexander TamasCraig StonahaDavid BarnholdtDavid NicklasFabrice EapJohn SJuan BenetMorgan HoughQuasarMark HeisingVinnie FalcoHypernovaChuck ZegarDanton SpiveyDonal BotkinEdmund FokschanerHank SJohn HofmannJohn PollockJohn R. SlavikJordan YoungJoseph SalomoneJulian TyackeJustin AshMathewMatthew O'ConnorSyed AnsarTimothy McCullochGamma Ray Burst A GAdrian HatchAdrien MolyneuxAlecZeroAndreas NautschAngela PriggeBradley JenkinsBrandon labonteDan WarrenDaniel LyonsDavid BethalaDFaulkEric KieblerFrederic SimonGeoffrey ShortGraydon GossGreg SmithJames FlowersJamie FrederickJohn FunaiJohn GriffithJohn RobinsonJonathan NesfederJoseph DillmanJosh ThomasKevin LeeKevin WarneKyle HoferMalte UblMichael ConroyNick VirtueNick WrightPatrick SuttonPaul RoseRobert IlardiScott GossettSean WarniahaSipke SchoorstraSteve BradshawTatiana VorovchenkoTim StephaniTonyfaceYurii Konovaliuk Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices