Page 12 of 44

How Electron Spin Makes Matter Possible

September 21, 2021 / / 0 Comments

Today I’m going to explain why you’re not falling through your chair right now using one simple fact, and one object. The fact is that all electrons are the same as each other, and the object is a structurally critical item of my clothing. There’s a chance this episode could get very weird.

Electrons DO NOT Spin
https://youtu.be/pWlk1gLkF2Y

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Neutron Stars: The Most Extreme Objects in the Universe

September 15, 2021 / / 0 Comments

We’ve traveled to lots of weird places on this show – from the interiors of black holes to the time before the big bang. But today I want to take you on a journey to what has got to be the weirdest place in the modern universe – a place where matter exists in states I bet you’ve never heard of. Today we take a journey to the center of the neutron star.

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First Detection of Light from Behind a Black Hole

September 7, 2021 / / 0 Comments

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How do you see the unseeable – how do you explore the inescapable? Our cleverest astronomers have figured out ways to catch light that skims the very edge of black holes. Let’s find out what they learned.

A few weeks ago a story made the rounds of pop-sci media proclaiming that for the first time light had been detected from behind a black hole. The reports were about a paper that claimed to have seen X-rays that came not from inside but from the back end black hole. This is obviously cool stuff – I mean, really anything new with black holes captures the public attention. But this result is cool in ways most people aren’t aware. And it brought us closer to a goal that I’ve been personally striving towards for years – trying to understand what happens in the vicinity of the largest black holes in the universe. I thought it would be worth doing a space time journal club on the Nature paper by Wilkins, Gallo, Costantini, Brandt & Blandford so I get to talk about my favorite subject in the universe.

Nature Paper
https://www.nature.com/articles/s41586-021-03667-0

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#space #blackholes #astrophysics

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How Vacuum Decay Would Destroy The Universe

August 18, 2021 / / 0 Comments

The universe is going to end. But of all the possible ends of the universe vacuum decay would have to be the most thorough – because it could totally rewrite the laws of physics. Today I hope to help you understand exactly how terrified you should be.

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How to Communicate Across the Quantum Multiverse

August 10, 2021 / / 0 Comments

Check Out Megawow on PBS Kids: https://youtu.be/meU4f31gqYI

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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How An Extreme New Star Could Change All Cosmology

August 3, 2021 / / 0 Comments

A new white dwarf has been discovered (poetically named: ZTF J1901+1458) that’s doing some stuff that no white dwarf should ever be able to do. In fact, it has multiple properties that are so extreme that it almost certainly did NOT form in the way that we thought all white dwarfs formed. This one peculiar point of faint light may change our understanding of not just white dwarfs, but of all cosmology.

Professor Dave Explains: Debunking the Electric Universe
https://youtu.be/T9q-v4lBGuw

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How Magnetism Shapes The Universe

July 21, 2021 / / 0 Comments

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How far can you follow a compass needle? As far as the north magnetic pole, where the needle starts spinning wildly? Compass needles align with magnetic field lines, and on the precise spot of magnetic north, those field lines are vertical. So just tilt your compass 90 degrees and you can continue your journey – either down to the molten iron dynamo surrounding the Earth’s core, or up. But up to where? The answer – to everywhere – and today, that’s where we’re going to go.

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Where Are The Worlds In Many Worlds?

July 13, 2021 / / 0 Comments

Many Worlds interpretation of quantum mechanics proposes that every time a quantum event gets decided, the universe splits so that every possible outcome really does occur. But where exactly are those worlds, and can we ever see them?

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Electrons DO NOT Spin

July 7, 2021 / / 0 Comments

Quantum mechanics has a lot of weird stuff – but there’s thing that everyone agrees that no one understands. I’m talking about quantum spin. Let’s find out how chasing this elusive little behavior of the electron led us to some of the deepest insights into the nature of the quantum world.

Spin Renderings by the Incredible Jason Hise
http://entropygames.net/

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How Quantum Entanglement Creates Entropy

June 23, 2021 / / 0 Comments

Entropy 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.

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