PBS Space Time

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Uploaded 23-03-22

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Today we’re going to ask a simple-seeming question that will lead to so pretty wacky places. The question is this: If the universe has a center, where is it?

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Spacetime is produced by Kornhaber Brown for PBS Digital Studios.
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© 2021 PBS. All rights reserved.

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Learn more at https://www.brilliant.org/spacetime

Uploaded 07-10-19

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Black holes are crazy enough on their own – but crash two together and you end up with a roiling blob of inescapable space that vibrates like a beaten drum. And the rich harmonics of those vibrations, seen through gravitational waves, could hold the secrets to the nature of the fabric of spacetime itself. Today on space time journal club we’ll explore the papers that claim to have detected black hole harmonics. We’ll also give you the latest updates on the most recent – in some cases quite bizarre - LIGO detections.

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When physicists talk about black holes they’re usually referring to highly theoretical objects – static, unchanging black holes viewed from “infinitely” far away. This makes everything clean and simple enough to attempt the already notoriously complex calculations of black hole physics. But real black holes are created in the violent deaths of massive stars, and there’s nothing clean about that. And we now know that black holes merge – and in the process produce gravitational radiation that we’ve only just managed to detect with the miraculous work of the LIGO and VIRGO gravitational wave observatories. In the instant after its merger, the new, joined black hole looks nothing like the idealized theoretical black hole.

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Uploaded 06-12-18

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How did life on Earth get started? Did life on Earth originate on another planet? Either Mars, or in a distant solar system? Could Earth life have spread to have seeded life elsewhere? Let’s see what modern science has to say about the plausibility of panspermia.

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Previous Episode:
'Oumuamua Is Not Aliens
https://www.youtube.com/watch?v=wICOlaQOpM0&t=455s

Hosted by Matt O'Dowd
Written by Matt O'Dowd
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Life existing on Earth is odd. The oldest fossils are now dated to only a few hundred million years after the moment Earth first became habitable. Is it really reasonable to imagine that evolution turned an unliving chemical soup into the first true living cells in that geological eye-blink? Well, maybe. But the discovery of the early appearance of life on Earth was definitely a big “huh, that’s weird” moment. And it’s inspired some creative thinking. For example, what if the first genesis of life – abiogenesis – is actually incredibly unlikely – so unlikely that it only happened once in the entire galaxy. And that “once” was not on Earth. What if primitive life arrived on Earth after having traveled vast distances across the Milky Way. Some scientists think this is the case. This is the Panspermia hypothesis.


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Uploaded 13-10-21

Paradoxically, the most promising prospects for moving matter around faster than light may be to put a metaphorical brick wall in its way. New efforts in quantum tunneling - both theory and experiment - show that superluminal motion may be possible, while still managing to avoid the paradox of superluminal signaling.Paradoxically, the most promising prospects for moving matter around faster than light may be to put a metaphorical brick wall in its way. New efforts in quantum tunneling - both theory and experiment - show that superluminal motion may be possible, while still managing to avoid the paradox of superluminal signaling.

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Watch our original Quantum Tunneling episode here:
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Relativistic Tunneling Paper
https://iopscience.iop.org/article/10.1088/1367-2630/abb515/pdf

Nature Paper
https://www.nature.com/articles/s41586-020-2490-7?proof=t

Hosted by Matt O'Dowd
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Uploaded 10-08-21

In the Many Worlds interpretation of quantum mechanics, the universal wavefunction is the reality, encompassing all possible histories and futures and all exist. But we are only sensitive to a slice of the wavefunction corresponding to our “world”, and due to the superposition principle our world can happily do its thing unperturbed by other parts of the wavefunction - other “ripples,” or worlds. And while it may seem like it would be physically impossible to have any connection between worlds, it may turn out to be entirely possible to communicate between them.

More About Steven Weinberg:
https://www.scientificamerican.com/article/learning-to-live-in-steven-weinbergs-pointless-universe/

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Thank you to Draper and its "We Hack the Moon" initiative for supporting PBS Digital Studios.
Learn more at https://wehackthemoon.com.

Uploaded 20-06-19

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Check out Physics Girl visit LIGO to see where they discovered Gravitational Waves
https://youtu.be/jtp71NT0GNg

Recently, the oldest quasar ever seen was discovered by the Gemini North telescope in Hawaii, the Magellan Telescopes at Las Campanas Observatory in Chile, as well as the Large Binocular Telescope in Arizona. In this first episode of the PBS DS mini-series, STELLAR, Matt travels to the top of Mauna Kea to visit the Gemini North telescope and see just how they found this ancient Quasar and it’s massive black hole.

Stellar is a brand new miniseries done in collaboration with Dianna Cowern from @Physics Girl and Joe Hanson from @It's Okay To Be Smart Over six episodes we travel to some of the world's most important telescopes, go inside amazing space research centers, and talk with brilliant scientists. Next up, Dianna from Physics Girl visits LIGO observatory in Washington that detected the very first gravitational waves. Then Joe Hanson visits one of the telescopes that was part of world spanning Event Horizon Telescope.

You'll be able to see future episodes on the Physics Girl and It’s Okay to be Smart YouTube channels, as well as the PBS Digital Studios Facebook page.

Stellar is a part of the PBS Summer of Space. There will be lots of awesome space-related content all summer long on PBS. See what's happening at https://www.pbs.org/summer-of-space/

#SummerOfSpacePBS #astrophysics #space

Special Thanks to Joy Pollard and Gemini Observatory for all their help making this episode.

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Hosted by Matt O'Dowd
Written by: Sophia Chen, Matt O'Dowd, Andrew Kornhaber, Eric Brown
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Producer: Randa Eid
Director of Photography: Eric Brouse
Sound: Tobi Nova
Production Assistant: Anna Bosketti
Editing: Pavel Ezrohi
Graphics: Murilo Lopes
Assistant Editing: Daniel Sircar
Produced By: Kornhaber Brown

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