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PBS Space Time
Do the Past and Future Exist?
PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Uploaded 13-10-20 Is all that exists just whatever exists right now? Is the past erased and the future a void yet to be filled? Well, the answer lies in between the past and the future - in the elusive, ever-moving eye-blink that we call the present. 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://pbsspacetime.com/ 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 Graphics by Leonardo Scholzer, Yago Ballarini, and Pedro Osinski Directed by: Andrew Kornhaber Camera Operator: Setare Gholipour Executive Producers: Eric Brown and Andrew Kornhaber End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0Q Special Thanks to Our Patreon Sponsors! Big Bang Supporters Marty Yudkovitz Brodie Rao Scott Gray Robert Doxtator Ahmad Jodeh Caed Aldwych Radu Negulescu Alexander Tamas Morgan Hough Juan Benet Fabrice Eap Mark Rosenthal David Nicklas Quasar Supporters Alec S-L Christina Oegren Mark Heising Vinnie Falco Hypernova William Bryan Mark Matthew Bosko Justin Jermyn Jason Finn Антон Кочков Julian Tyacke Syed Ansar John R. Slavik Mathew Danton Spivey Donal Botkin John Pollock Edmund Fokschaner Joseph Salomone Matthew O'Connor Chuck Zegar Jordan Young Hank S John Hofmann Timothy McCulloch Gamma Ray Burst Astronauticist Summit137 Darren Duncan Lily kawaii Russ Creech Jeremy Reed Max Bernard Magistrala Хемус [Kybrit] Bill Blair Eric Webster Steven Sartore James Younger David Johnston J. King Michael Barton James Ramsey Mr T Andrew Mann Jeremiah Johnson fieldsa eleanory Peter Mertz Kevin O'Connell Richard Deighton Isaac Suttell Devon Rosenthal Oliver Flanagan Dawn M Fink Bleys Goodson Darryl J Lyle Robert Walter Bruce B Ismael Montecel M D Andrew Richmond Simon Oliphant Mirik Gogri David Hughes Mark Daniel Cohen Brandon Lattin Yannick Weyns Nickolas Andrew Freeman Brian Blanchard Shane Calimlim Tybie Fitzhugh Robert Ilardi Eric Kiebler Tatiana Vorovchenko Craig Stonaha Michael Conroy Graydon Goss Frederic Simon Greg Smith Sean Warniaha Tonyface John Robinson A G Kevin Lee Adrian Hatch Yurii Konovaliuk John Funai Cass Costello Geoffrey Short Bradley Jenkins Kyle Hofer Tim Stephani Luaan AlecZero Malte Ubl Nick Virtue Scott Gossett David Bethala Dan Warren Patrick Sutton John Griffith Daniel Lyons Josh Thomas DFaulk Kevin Warne Andreas Nautsch Brandon labonte Lucas Morgan Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices
Today · 20 min
Sleepy Facts About the Universe
Is Time a Universal Clock or a Personal Path? - Why Moving Clocks Disagree | Sleepy Facts About the Universe
Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode! Two friends stand on a train platform, synchronize their watches, and part ways. When they reunite, their watches display different elapsed times. Neither clock is broken, and neither traveler experienced anything strange. This deceptively simple scenario opens the door to one of the most profound shifts in modern physics: the realization that time is not a universal background clock, but a geometric property of a path through spacetime. This episode examines what a clock actually measures when it moves through the world. We explore how Einstein dismantled the Newtonian idea of absolute time, and how Hermann Minkowski’s four-dimensional spacetime provides the framework to understand why different travelers experience different durations. By distinguishing proper time—the physical duration a traveler actually lives and records—from coordinate time, we see why the so-called twin paradox is not a paradox at all, but a simple geometric fact. Real-world examples, from cosmic ray muons surviving atmospheric decay to the daily relativistic corrections required for GPS satellites, ground these abstract concepts in measurable reality. I wanted to understand why we cannot simply say that a moving clock runs slow. The answer requires letting go of the intuition that time flows uniformly for everyone everywhere. I found that looking at time as a distance traveled through a unified spacetime framework offers a far more accurate picture of reality. It is a quiet shift in perspective, but it changes how we understand the very duration of our lives.
Today · 23 min
PBS Space Time
Quantum Physics in a Mirror Universe
To learn to think like a scientist check out http://Brilliant.org/SpaceTime Uploaded 12-12-18 PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE Check out the new Space Time Merch Store! https://pbsspacetime.com/ When you look in mirror, and see what you think is a perfect reflection. You might be looking at universe whose laws are fundamentally different. You can further support us on Patreon at https://www.patreon.com/pbsspacetime Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: http://www.reddit.com/r/pbsspacetime Help translate our videos! https://www.youtube.com/timedtext_cs_... Previous Episode: Did Life on Earth Come from Space? https://www.youtube.com/watch?v=REl20rlZGTw Hosted by Matt O'Dowd Written by Graeme Gossel and Matt O'Dowd Graphics by Luke Maroldi Assistant Editing and Sound Design by Mike Petrow Made by Kornhaber Brown (www.kornhaberbrown.com) When we think about symmetry, the first thing that comes to mind is mirror symmetry. Butterflies, Rorschach tests, and classically attractive faces all look the same when flipped left-to-right. In physics, a symmetry is when the laws of physics are unchanged due to some transformation of coordinates. We’ve seen examples where it is - the universe is symmetric to coordinate shifts in space, time, and even the rather abstract phase of the wave function. So it might be surprising to learn that with all the weird ways in which the universe IS symmetric, it’s NOT entirely symmetric under this most intuitive one. The laws of physics work differently in the universe of the mirror. Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters: Big Bang David Nicklas CoolAsCats Anton Lifshits Fabrice Eap Justin Lloyd Juan Benet Quasar Tambe Barsbay Mark Rosenthal Dean Fuqua James Flowers Vinnie Falco Hypernova Chuck Zegar Jordan Young Joseph Salomone John Hofmann Matthew O’Connor Edmund Fokschaner Donal Botkin Danton Spivey Mark Heising Thanks to our Patreon Gamma Ray Burst Supporters: Alexey Eromenko Brandon Cook Brandon Labonte Carlo Mogavero Daniel Lyons David Crane Dustan Jones Greg Weiss Jack Frosch James Hughes James Quintero JJ Bagnell John Webber Jinal Doshi Jon Folks Joseph Emison Josh Thomas Kenneth F Leonard Kevin Warne Malte Ubl Mark Vasile Nathan Hitchings Nicholas Rose Nick Virtue Ratfeast Richard Broman Scott Gossett Shawn Azman Tim Stephani Tommy Mogensen سلطان الخليفي Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices
Today · 21 min
Fakten zum Einschlafen – Das Universum
Ist Zeit real oder nur eine Illusion der Veränderung? - Newton, Einstein und das Wesen der Zeit | Fakten zum Einschlafen - Das Universum
Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode! Jede Uhr, die wir je gebaut haben, misst nicht die Zeit selbst, sondern Veränderung. Ob Pendel, Quarzkristall oder Atomuhr, sie alle zählen physikalische Prozesse und vergleichen diese miteinander. Doch was passiert, wenn wir annehmen, dass Zeit nichts weiter ist als die Ordnung dieser Veränderungen? Diese Episode traced die Geschichte dieser grundlegenden Frage von Aristoteles über den historischen Streit zwischen Newton und Leibniz bis hin zu Albert Einsteins Relativitätstheorie. Wir betrachten, wie die moderne Physik den absoluten zeitlichen Hintergrund auflöste und ihn durch eine dynamische Raumzeitgeometrie ersetzte, in der Uhren abhängig von Geschwindigkeit und Gravitation unterschiedlich schnell ticken. Kürzlich fragte ich mich, ob das Universum überhaupt Zeit bräuchte, wenn sich absolut nichts veränderte. Bei der Arbeit an dieser Episode kehrte ich immer wieder zu dieser Frage zurück, denn die Physik liefert uns verblüffend präzise Vorhersagen über das Verhalten von Uhren, lässt aber die tiefere metaphysische Frage offen, ob Zeit nun eine eigenständige Entität, eine bloße Relation oder eine emergente Struktur ist. Ich finde es faszinierend, wie eine scheinbar alltägliche Beobachtung an einer Pendeluhr direkt an die Grenzen von Quantenmechanik und Kosmologie führt. Wir werden das Zwillingsparadoxon, das Hafele-Keating-Experiment und die Eigenzeit betrachten, um zu verstehen, warum wiedervereinigte Uhren objektiv verschiedene Stände anzeigen. Begleiten Sie mich bei der Suche nach einer Antwort auf die Frage, ob an der Zeit mehr ist als nur das Maß für Veränderung.
Today · 30 min