PBS Space Time

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Uploaded 17-02-21

Check Out Overview on PBS Terra: https://youtu.be/Pgj95EntvW0

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It was pretty impressive when LIGO detected gravitational waves from colliding black holes. Well we’ve just taken that to the next level with a galaxy-spanning gravitational wave detector that may have detected a foundational element of space itself - the gravitational wave background.

Walk the Arecibo Catwalk With Matt:
https://www.youtube.com/watch?v=-5j98wi_M2w&ab_channel=PBSSpaceTime

Learn More About Gravitational Waves
https://youtu.be/gw-i_VKd6Wo

#space​​ #gravitationalwaves #discovery

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Hosted by Matt O'Dowd
Written by Matt O'Dowd
Graphics by Leonardo Scholzer, Yago Ballarini, Pedro Osinski, Adriano Leal and Stephanie Faria
GFX Visualizations: Katherine Kornei
Directed by Andrew Kornhaber
Assistant Producer: Setare Gholipour
Executive Producers: Eric Brown and Andrew Kornhaber

Sound of Pulsars
https://www.parkes.atnf.csiro.au/people/sar049/eternal_life/supernova/pulsars.html

End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0Q

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Uploaded 31-01-18

What happens when a star eats its planets? Find out on today’s Space Time Journal Club.

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Previous Episode:
The End of Habitable Zone
https://www.youtube.com/watch?v=wwGeCfWc100


RESOURCES
Starlifting
https://youtu.be/pzuHxL5FD5U

Kronos and Krios: Evidence for Accretion of a Massive, Rocky Planetary System in a Comoving Pair of Solar-Type Stars
https://arxiv.org/pdf/1709.05344.pdf
https://arxiv.org/abs/1709.05344

Korycansky, Laughlin and Adams 2000
https://deepblue.lib.umich.edu/bitstream/handle/2027.42/41972/10509_2004_Article_282187.pdf?sequence=1&isAllowed=y


Our story begins where every story begins. In the heart of a vast cloud of gas and dust drifting through interstellar space. It is here that stars are born. We’ve talked about this process before, so in short: essentially all stars form in these stellar nurseries, and they form in the many thousands before being ejected from their birth clusters to wander the galaxy. Our Sun wanders alone, and we have no idea where its sibling stars might be.

Hosted by Matt O'Dowd
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Uploaded 03-02-20

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If the universe goes on forever, does that mean there are infinite versions of you out there?

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End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0Q

The cosmological equations that so beautifully describe our universe make an uncomfortable prediction: interpreting them in the most straightforward way, they tell us that the universe may be infinite. Or not; it could turn out that the universe contains enough matter and energy to close in on itself and be finite, or perhaps the simplest interpretation of the cosmological equations is TOO simple. But according to our best theoretical understanding, an infinite universe seems at least possible - and some would say likely. If so this raises an even more crazy possibility. An infinite universe may literally contain every possible thing allowable by the laws of physics - each in infinite multitude. And that includes infinite versions of you. Today I’m going to try to convince THIS version of the reality of all of the others.

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Uploaded 23-05-18

If you have perfect knowledge of every single particle in the universe, can you use the laws of physics to rewind all the way back to the Big Bang? Is the entire history of the universe perfectly knowable? Or has information somehow lost along the way?

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Previous Episode:
Noether's Theorem and The Symmetries of Reality
https://www.youtube.com/watch?v=04ERSb06dOg&t=2s

The laws of physics are equations of motion. They are mathematical rules that dictate how systems evolve in time. Newton’s equations for classical mechanics, Maxwell’s equations for electromagnetism, and the Schrodinger equation for quantum mechanics. These laws can be used to predict how the universe will evolve into the future. They are deterministic; perfect knowledge of a system in the present perfectly predicts how the system will change in the next instant, and the instant after that, ad infinitum. But determinism in the forward-time direction does NOT guarantee that the same laws can perfectly predict the past. And yet this sort of deterministic symmetry - time-reversal symmetry - is essential for information itself to be conserved. Today we learn why conservation of information is such a fundamental requirement of quantum mechanics. In a future episode we’ll see how this law might be broken by black holes.

Here's that fun proof that independent quantum states can't evolve into the same quantum state while preserving unitarity! Apologies for the unavoidable technical notation, but a quick college course in introductory quantum mechanics will get you up to speed in no time :-P

http://bit.ly/2Lpm6sL

Hosted by Matt O'Dowd
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Check Out Subcultured's Anime Episode on PBS Voices: https://youtu.be/oSCj8H4TGTo

Uploaded 16-03-22

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If you've studied any physics you know that like charges repel and opposite charges attract. But why? It's as though this thing - electric charge - is as fundamental a property of an object as its mass. It just sort of ... is. Well it turns out if you dig deep enough, the fundamental-ness of charge unravels, and in many things, including mass itself, are unraveled with it.

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Hosted by Matt O'Dowd
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Post Production by Leonardo Scholzer, Yago Ballarini, Pedro Osinski, Adriano Leal and Stephanie Faria
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Assistant Producer: Setare Gholipour
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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.

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