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	2022-07-20: What If We Live in a Superdeterministic Universe? 11:54: And that’s … impossible because if you trace the past lightcone of any two points in the observable universe back far enough they will overlap.
	2022-04-20: Does the Universe Create Itself? 16:10: ... the cosmic event horizon would have wavelength roughly the size of the observable universe. Unfortunately that makes it not very detectable without a universe-sized ... 17:39: ... fact - if you calculate the size of a black hole with the mass of our observable universe - adding together all the stars, dark matter, other black holes, ...
	2022-03-23: Where Is The Center of The Universe? 12:47: ... and that if you zoom out to many, many, many times larger than the observable universe, everything evens out ...
	2022-02-23: Are Cosmic Strings Cracks in the Universe? 08:50: ... expanding universe stretched them up to the size   of the observable universe. We actually expect  multiple nucleation events in each causal ...
	2022-01-12: How To Simulate The Universe With DFT 00:00: ... you used every particle in the observable universe to solve the schrodinger equation and do full quantum simulation of some ...
	2021-12-29: How to Find ALIEN Dyson Spheres 12:08: There are hundreds of billions of galaxies in the observable universe.
	2021-10-05: Why Magnetic Monopoles SHOULD Exist 12:16: ... things far apart that there may be very few remaining in our entire observable universe. ...
	2021-08-18: How Vacuum Decay Would Destroy The Universe 10:10: ... for a single such bubble to be likely to appear somewhere in our observable universe.   So, somewhere between vaguely  unlikely and staggeringly ...
	2020-10-13: Do the Past and Future Exist? 09:04: ... the effect is tiny, but the “present” at the edge of the observable universe veers back and forth by a couple of centuries every time you switch ...
	2020-07-28: What is a Theory of Everything: Livestream 00:00: ... if we were able to figure out a way to communicate with a part of the observable universe or the universe that we're not within or some other universe even if ...
	2020-02-11: Are Axions Dark Matter? 12:47: ... 13.5 billion years it would be around 10^10^50 times the size of our observable universe. And that sounds about right. He then compares that to an estimate of the ... 15:20: ... that is itself large enough to fit all possible configurations of observable universe sized regions. The volume would want to be 10^10^123 (or 90) times our ...
	2020-02-03: Are there Infinite Versions of You? 09:40: For our 46-billion light year observable universe there are definitely no more than 2^10^123 possible unique configurations. 09:52: As long as the greater universe has more than than that many observable universe-sized regions, one of them should be identical to this one.
	2019-11-18: Can You Observe a Typical Universe? 00:45: ... Way is an ordinary galaxy among 100s of billions of galaxies in the observable universe. ... 05:45: All particles in the observable universe were packed together in a subatomic-sized dot. 08:33: For example a fluctuation the size of a galaxy is insanely more likely than one the size of our observable universe.
	2019-09-30: How Many Universes Are There? 12:51: But it still should NOT be surprising that we don’t see evidence of bubble collisions in our observable universe.
	2019-08-06: What Caused the Big Bang? 00:43: ... being: why is matter and energy so smoothly spread out across the entire observable universe? ...
	2019-07-25: Deciphering The Vast Scale of the Universe 00:30: In fact there are surely more entire worlds in the observable universe than there are grains of sand on this one.
	2019-05-16: The Cosmic Dark Ages 00:04: ... era. Somewhere between 10 and 1000 billion trillion stars fill the observable universe with light. But there was a time before the first star ...
	2019-04-03: The Edge of an Infinite Universe 00:37: For example we have the “observable universe” – that patch that we can see, and beyond which light has not yet had time to reach us. 00:57: Our observable universe is like a tiny patch of land in a vast plain.
	2019-02-07: Sound Waves from the Beginning of Time 13:43: Well, the answer is- it depends on what size you consider. For the entire observable universe?
	2018-10-10: Computing a Universe Simulation 03:34: ... that the maximum information content, the Bekenstein bound, of the observable universe is around 10 to the power of 120 bits based on its surface ... 03:59: ... bound suggests that we could hold all of the information in the observable universe within a storage device smaller than the observable universe, which ... 05:13: ... informationally speaking, you could store the entire observable universe of non-radiation particles on the surface area of a black hole the size ... 08:04: ... the energy of the system, we use the mass of the observable universe, around 10 to the power of 52 kilograms, and then apply good old e equals ...
	2018-10-03: How to Detect Extra Dimensions 08:14: ... itself, which defines the three-dimensional structure on which our observable universe exists, can actually expand into the extra fourth spatial ...
	2018-09-20: Quantum Gravity and the Hardest Problem in Physics 14:35: dabeste points out that it's important to emphasize that you're talking about the observable universe, not the entire universe. 14:43: ... size of the storage device needed to store all of the information in the observable universe. ...
	2018-09-12: How Much Information is in the Universe? 01:07: How much information does it take to describe the entire observable universe? 05:04: ... observable universe has a surface area of 10 to the power of 120 to 10 to the power of 124 ... 06:02: The observable universe contains something like 10 to the power of 80 protons. 06:27: The cosmic microwave background has around 10 to the power of 89 photons across the observable universe. 09:47: How large a black hole computer would you need in mass and radius to contain enough data to simulate the entire observable universe? 15:24: ... reliably eliminate all of the 10 to the power of 80 protons in the observable universe, you need around 265 half-lives, or 10 to the power 42 to 43 ...
	2018-08-23: How Will the Universe End? 06:45: So in something like 10 to the power of 39 or 10 to the power 40 years, all protons in the observable universe will be gone.
	2018-04-11: The Physics of Life (ft. It's Okay to be Smart & PBS Eons!) 01:24: ... energy being concentrated in your cup of coffee or all the matter in the observable universe being crunched into an infinitely dense point are low ...
	2018-01-17: Horizon Radiation 01:01: ... no information can travel or the cosmological horizon that limits the observable universe. ...
	2017-10-25: The Missing Mass Mystery 00:18: ... PLAYING] Our astronomical surveys have revealed an observable universe full of hundreds of billions of galaxies, each of them with as many ... 00:41: When we extrapolate observations to the entire observable universe, we find a billion trillion suns worth of mass.
	2017-08-10: The One-Electron Universe 10:59: ... we talked about the controversial evidence that many galaxies in the observable universe are drifting very slightly towards a point beyond the cosmic ... 11:23: ... assuming it's caused by a gravitational influence beyond the edge of the observable universe, then yeah, it no longer exerts a force on ...
	2017-08-02: Dark Flow 00:08: It may be that much of the matter in the cosmos is drifting due to the ancient gravitational pull of something outside the observable universe. 05:07: But what if you could measure the effect from hundreds of clusters across the observable universe? 07:50: ... the dark flow, because that flow seems to affect galaxies across the observable universe, or to two and a half billion light years at least, far beyond the ... 08:08: ... of a gravitational attraction towards something beyond the edge of the observable universe. ... 08:32: In the earliest instance of the Big Bang, the observable universe was compressed into a subatomic scale. 08:58: ... horizon, there exists a region of much more stuff, a different bubble of observable universe with more galaxies, more clusters, more dark ...
	2017-01-25: Why Quasars are so Awesome 06:49: But when viewed from halfway across the observable universe, that is impossibly tiny.
	2016-10-12: Black Holes from the Dawn of Time 02:35: It's thought that these fluctuations originally formed when the entire observable universe was smaller than a single atom.
	2016-04-27: What Does Dark Energy Really Do? 10:16: If positively curved, that would mean a finite but very, very large greater universe with a volume at least 250 times that of our observable universe. 11:12: And even then, they don't cover the entire observable universe.
	2016-03-30: Pulsar Starquakes Make Fast Radio Bursts? + Challenge Winners! 04:55: That's the mass of all the protons and neutrons in the observable universe. 05:11: ... the proton, and we get that there are 6 by 10 to the 79 protons in the observable universe, and just as many ...
	2016-03-23: How Cosmic Inflation Flattened the Universe 00:49: The observable universe is impossibly huge.
	2016-03-16: Why is the Earth Round and the Milky Way Flat? 11:42: Our observable universe was a tiny speck in that volume. 12:16: And at the moment of recombination, when the CMB was emitted, it was emitted by all of the observable universe and beyond at the same time.
	2016-03-09: Cosmic Microwave Background Challenge 00:43: In the process, the distance that the average photon could travel went from not very far to greater than the length of the entire observable universe. 02:10: ... those blobs evolve into are now 1,100 times further away, giving us an observable universe that's 93 billion light years ... 03:24: ... need an estimate of the baryonic mass and volume of the observable universe, you'll need the redshift of the CMB, and the Thomson Scattering ...
	2016-03-02: What’s Wrong With the Big Bang Theory? 01:00: And at that point, the entire observable universe was around the size of a grain of sand. 04:05: And pack all of the galaxies in the entire observable universe into a space 10 to the power of minus 20th of the width of a proton. 05:40: ... one patch to the next by at most one part in 100,000 across the entire observable universe. ... 11:22: ... "universe." Everything that we can see to our cosmic horizon, so the observable universe, was once compacted into something smaller than a grain of sand, and ... 07:16: So those edges shouldn't be in each other's observable universes, not then, not now.
	2016-02-24: Why the Big Bang Definitely Happened 02:36: ... fact, with raw general relativity, we get that the entire observable universe was once compacted into an infinitesimal point, a singularity at time t ... 07:37: ... early age of 10 to the power minus 32 seconds, when the entire current observable universe was around the size of a grain of sand, give or ...
	2016-02-11: LIGO's First Detection of Gravitational Waves! 03:56: Advanced LIGO can feel the ripples produced by merging black holes through a volume of space equal to about 0.1% of the observable universe.
	2015-12-16: The Higgs Mechanism Explained 03:40: ... the simplest is to say that while the photon can cross the entire observable universe without bumping into a single thing, the electron is never not bumping ...
	2015-12-09: How to Build a Black Hole 00:21: ... whose boundary curvature effectively removes the interior from our observable universe. ...
	2015-10-28: Is The Alcubierre Warp Drive Possible? 05:08: In fact, it would take significantly more negative energy than there is positive mass/energy in the entire observable universe.
	2015-10-15: 5 REAL Possibilities for Interstellar Travel 02:30: And to do that with any liquid rocket fuel, you'd need a fuel tank larger than the observable universe.
	2015-09-30: What Happens At The Edge Of The Universe? 01:04: In a previous episode, we talked about the size of what we call the observable universe. 03:02: It's a boundary to the observable universe. 04:40: Move to my left, and my observable universe moves with me.
	2015-02-25: How Do You Measure the Size of the Universe? 00:52: So we're going to focus on the observable universe. 01:31: And that's the radius of the observable universe. 02:18: ... can expand at a variable rate, complicate how we measure the size of the observable universe. ... 05:13: So that's how we know that the observable universe is about 90 billion light years in diameter.

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