What If Charge is NOT Fundamental?

March 16th, 2022

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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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Is the Proxima System Our Best Hope For Another Earth?

March 8th, 2022

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At just four light years away, Proxima Centauri is our closest solar neighbor. The recent discovery of the new exoplanet Proxima D, has reopened the discussion of whether the proxima system is our best chance at reaching another Earth. How did we discover Proxima D? How do we know what the conditions are on planets so far away? Watch the episode to learn more.

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Posted in Physics |

Are Cosmic Strings Cracks in the Universe?

February 23rd, 2022

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Reality has cracks in it. Universe-spanning filaments of ancient Big Bang energy, formed from topological defects in the quantum fields, aka cosmic strings. They have subatomic thickness but prodigious mass and they lash through space at a close to the speed of light. They could be the most bizarre undiscovered entities that actually exist.

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Posted in Physics |

Is The Wave Function The Building Block of Reality?

February 16th, 2022

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Objective Collapse Theories offer a explanation of quantum mechanics that is at once brand new and based in classical mechanics. In the world of quantum mechanics, it’s no big deal for particles to be in multiple different states at the same time, or to teleport between locations, or to influence each other faster than light. But somehow, none of this strangeness makes its way to the familiar scale of human beings – even though our world is made entirely of quantum-weird building blocks. The explanations of this transition range from the mystical influence of the conscious mind to the grandiose proposition of multiple realities. But Objective Collapse Theories feels as down to earth as the classical world that we’re trying to explain. Let’s see if it makes any sense.

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Posted in Physics |

The Nature of Space and Time AMA

February 10th, 2022

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Posted in Physics |

How Does Gravity Escape A Black Hole?

January 27th, 2022

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Fact: in a black hole, all of the mass is concentrated at the singularity at the very center. Fact: every black hole singularity is surrounded by an event horizon. Nothing can escape from within the event horizon unless it can travel faster than light. Fact: gravity travels at the speed of light. So how does a black hole manage to communicate its gravitational force to the outside universe? How does gravity escape a black hole?

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Posted in Physics |

How To Build The Universe in a Computer

January 19th, 2022

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We routinely simulate the universe on all of its scales, from planets to large fractions of the cosmos. Today we’re going to see how it’s possible to build a universe in a computer – and see whether there’s a limit to what we can simulate.

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Posted in Physics |

How To Simulate The Universe With DFT

January 12th, 2022

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*****

If you used every particle in the observable universe to do a full quantum simulation, how big would that simulation be? At best a large molecule. That’s how insanely information dense the quantum wavefunction really is. And yet we routinely simulate systems with thousands, even millions of particles. How? By cheating. Using the ultimate compression algorithm: Density Functional Theory (DFT). Let’s learn how to cheat the universe.

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Posted in Physics |

How to Find ALIEN Dyson Spheres

December 29th, 2021

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On 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.

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Posted in Physics |

What Happens If A Black Hole Hits Earth?

December 20th, 2021

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The possibility that a black hole could actually impact Earth may seem straight out of science fiction, but the reality is that microscopic primordial black holes could actually hit Earth. If one did, it wouldn’t just impact like an asteroid, it’d pass straight through the entire Earth and exit the other side. Perhaps craziest of all, this may have already happened!

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Posted in Physics |

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