Search PBS Space Time

Results

2022-11-16: Are there Undiscovered Elements Beyond The Periodic Table?

  • 18:57: ... Cleveland points out that life may have had the potential to arise many times on early, except for the fact that once one incident ...

2022-11-09: What If Humanity Is Among The First Spacefaring Civilizations?

  • 08:27: This can cause erratic climates and make any potential inhabitants vulnerable to solar flares.
  • 19:36: ... conspiracy of influences connecting every measurement device with every potential measurement subject, and I’ve never heard a good description of how the ...

2022-10-26: Why Did Quantum Entanglement Win the Nobel Prize in Physics?

  • 10:10: ... be measured at the moment of their creation, which if you recall was the potential loophole in Clauser and Freedman’s ...

2022-10-19: The Equation That Explains (Nearly) Everything!

  • 03:36: ... states. For classical physics it simplifies to just Kinetic Energy minus Potential ...
  • 08:23: ... need an extra term to describe the potential energy of that interaction, which we add to the kinetic term. Here we ...
  • 13:07: ... the last term refers to the potential of the Higgs field. This is like the kinetic terms for the other bosons, ...

2022-09-14: Could the Higgs Boson Lead Us to Dark Matter?

  • 07:34: ... is a whole family of potential theories of how the Higgs could interact with dark matter, these all ...

2022-08-24: What Makes The Strong Force Strong?

  • 05:07: If we have different charges then we have a potential for attractive forces.

2022-07-27: How Many States Of Matter Are There?

  • 07:16: Here it's temperature versus baryonic potential instead of pressure, which is basically how much energy quarks can absorb or emit.

2022-07-20: What If We Live in a Superdeterministic Universe?

  • 02:39: We say that measurement “collapses” the wavefunction, obliterating all potential results in favor of one actual result.

2022-06-22: Is Interstellar Travel Impossible?

  • 03:55: This is the number one potential dealbreaker for our future as a galactic species.

2022-06-15: Can Wormholes Solve The Black Hole Information Paradox?

  • 00:00: ... we need to consider that each real black hole has the potential to be connected to multiple imaginary black holes via wormholes. And you ...

2022-05-25: The Evolution of the Modern Milky Way Galaxy

  • 16:02: ... are also found on   gas giant moons - so that boosts our  potential abiogenesis location number quite a ...

2022-05-18: What If the Galactic Habitable Zone LIMITS Intelligent Life?

  • 04:32: ... surface. So it sounds like the galaxy should  be full of potential starting points for life,   even if we assume that life ...
  • 12:04: ... was supposed help explain   the Fermi Paradox by reducing the potential  origins for life, it’s done the ...

2022-04-27: How the Higgs Mechanism Give Things Mass

  • 07:01: ... in a valley.   The “walls” of the valley are just the  potential energy - the energy stored when the   field value moves away ...
  • 07:52: ... It’s really just the difference between  the kinetic energy and the potential energy   in the field. Our plot was  of the potential ...
  • 08:09: ... strength of the field everywhere in space.   The potential energy part is the “shape” of the  field, and is made of various ...
  • 10:15: ... mass   energy to be able to oscillate  up and down the potential ...
  • 10:23: ... this potential doesn’t give us massive gauge  bosons. Let’s make a slight change. ...
  • 10:50: ... still a symmetric potential - it has the  same global U(1) symmetry as the ...
  • 12:59: ... because that gives us the basic picture. Because  the potential is the same all around the valley,   it shouldn’t be possible ...
  • 13:44: ... a much  more complex Lagrangian with this Mexican hat   potential. Weird stuff happens when the gauge  field couples to the particles ...
  • 15:06: ... the full electroweak   U(1)xSU(2) invariance on the true Higgs potential  gets you three Goldstone bosons that are eaten by   3 of the 4 ...

2022-02-23: Are Cosmic Strings Cracks in the Universe?

  • 00:58: ... still contained a lot of energy.   The shape of this so-called potential curve  depends on the temperature. As the universe   ...
  • 05:59: ... was forced to take on the Higgs value at the top  of the potential hill rather than the valley. It   became a fossil of the ...
  • 10:09: ... regular flashes of light from pulsars.   It also has the potential to spot the tell-tale signals from gravitationally radiating kinks ...
  • 12:19: ... is,   in a sense, a combination of the two. This gives us a potential way to distinguish our   cosmic string-type. If one of these ...

2022-02-16: Is The Wave Function The Building Block of Reality?

  • 07:17: ... this “hitting” mechanism gives a potential explaination for the quantum-classical divide - it simply depends on the ...

2022-01-19: How To Build The Universe in a Computer

  • 07:08: ... are converted into a density distribution and a gravitational  potential across the ...

2022-01-12: How To Simulate The Universe With DFT

  • 01:48: ... assuming the particle is in some environment described by a sum of potential energies - that’s the V. V could result from the electromagnetic field ...
  • 11:30: Then iterate until everything is consistent - when the ground state energy, the potential, and the charge density converge.
  • 14:32: Thanks for keeping us functional, and for helping us realize our true potential.
  • 19:16: Phudlow may have hit on the biggest potential energy sink - FTL travel, if possible, will certainly take a ridiculous amount of energy.
  • 19:50: Another potential energy need is matrioskha brain.

2021-11-17: Are Black Holes Actually Fuzzballs?

  • 13:00: ... our vision of what a black hole could be and provided a satisfying potential resolution to several ...
  • 14:42: Your feedback really helps us understand what you’re interested in and you even get to vote on potential new shows!

2021-11-02: Is ACTION The Most Fundamental Property in Physics?

  • 02:21: ... out moving fast - it has a lot of kinetic energy, which it trades for potential energy as it rises, and then back to kinetic as it falls. If you need a ...
  • 02:50: ... realized that a particular combination of kinetic and potential energy had the same minimizing property as does time for the path of ...
  • 03:17: ... the Action. Formally, it’s the integral over time of the kinetic minus potential ...
  • 05:52: ... can minimize to find Mercury’s orbit. After all, planets trade between potential and kinetic energy as they move around their orbits, just like the ...
  • 08:06: ... this is that in the classical limit proper time becomes kinetic minus potential energy for objects with mass, but for objects without mass, like light, ...
  • 10:26: ... this case the quantum action doesn’t come from adding up kinetic minus potential energy nor the proper time. Instead, it effectively calculates the phase ...
  • 12:16: ... space refers to all the places the ball could reach with its current Potential and Kinetic Energies. When we take this to relativity we see the ...

2021-10-20: Will Constructor Theory REWRITE Physics?

  • 12:30: ... of  tunneling. The presence of a barrier changes the   potential energy in that region. If that potential  barrier is too high for ...

2021-10-13: New Results in Quantum Tunneling vs. The Speed of Light

  • 01:51: ... forces, forming energetic hills and valleys - a landscape of so-called potential ...
  • 02:03: For example, the protons and neutrons in an atomic nucleus are held in the potential barrier of the strong nuclear force.

2021-09-07: First Detection of Light from Behind a Black Hole

  • 15:03: ... using the large hadron collider to try to map the shape of the Higgs potential by looking at Higgs boson pair ...
  • 16:05: Dr Bryant, if you wouldn't mind hurrying up with mapping the Higgs potential so we know the answer to this, that’d be great.

2021-08-18: How Vacuum Decay Would Destroy The Universe

  • 05:43: ... think about the potentially  catastrophic consequences of   this. Firstly, if the Higgs ...

2021-08-10: How to Communicate Across the Quantum Multiverse

  • 15:46: ... the internal pressure, the fusion rate, etc. You can actually defuse a potential future supernova by sucking away its outer layers. The question is the ...

2021-08-03: How An Extreme New Star Could Change All Cosmology

  • 17:08: ... number of you ask questions about the potential role of magnetic fields in the universe that all have the answer I just ...

2021-07-21: How Magnetism Shapes The Universe

  • 15:23: And Jack Williams leads us on a thought experiment that demonstrates a potential absurdity.

2021-07-13: Where Are The Worlds In Many Worlds?

  • 06:37: ... wires, through computer circuitry, as photons from the screen, as action potentials down our optical nerves, and finally as signals in our ...

2021-02-24: Does Time Cause Gravity?

  • 09:10: ... “the time before the big bang” - which I mentioned in reference to a potential component of the gravitational wave ...

2020-11-11: Can Free Will be Saved in a Deterministic Universe?

  • 12:31: You don't choose the mechanical behavior of your brain's atoms or the electrical potential that triggers each firing neuron.

2020-10-20: Is The Future Predetermined By Quantum Mechanics?

  • 13:27: ... should ascribe existence to the slice of the present as defined by any potential observer on that first ...

2020-09-28: Solving Quantum Cryptography

  • 09:45: That gives us the potential for a one-way function.
  • 16:25: Some of you thought it was funny that we would do an episode on life in the sun right after the potential discovery of life on venus.

2020-08-10: Theory of Everything Controversies: Livestream

  • 00:00: ... the political economy of physics is destroying the actual research potential so that's what's fascinating to me and i'm really looking forward to ...

2020-07-28: What is a Theory of Everything: Livestream

  • 00:00: ... talk to dark matter and also does it have what's the shape of its potential and that if you measure the shape of the potential of the higgs boson ...

2020-06-15: What Happens After the Universe Ends?

  • 17:19: ... from somewhere like Mars that has the potential for past habitability demand a biosafe level 4 facility with additional ...

2020-05-27: Does Gravity Require Extra Dimensions?

  • 06:25: ... we’ve never detected these extra dimensions, they seem a promising potential solution to unifying gravity with the other forces - and in the process ...

2020-05-18: Mapping the Multiverse

  • 12:42: ... unstable, and the whole thing collapses, shutting off any potential magical portals to time machines or new universes - probably before they ...

2020-04-28: Space Time Livestream: Ask Matt Anything

  • 00:00: ... about what it is kinetic energy half MV squared okay gravitational potential energy okay GM M over R okay these these are mathematical quantities ...

2020-02-24: How Decoherence Splits The Quantum Multiverse

  • 10:34: Imagine just two potential locations for the original double-slit photon.

2020-02-18: Does Consciousness Influence Quantum Mechanics?

  • 15:28: ... particles because it has a lowest energy state - a value for theta where potential energy is lowest, and on either side of which energy ...

2020-02-11: Are Axions Dark Matter?

  • 06:54: ... in a quantum field. So with a new field - this theta field - we have the potential for new particles. Theta can oscillate very slightly around its value of ...
  • 11:08: ... nature of dark matter. Not bad for one of the tiniest and most elusive potential particles in all of ...

2019-12-09: The Doomsday Argument

  • 00:47: We touched on both the potential power and potential misuse of this principle.
  • 01:20: ... get something we can use: our existence selects for a particular type of potentially-rare observer-supporting environments, but we should expect to find ourselves ...

2019-11-18: Can You Observe a Typical Universe?

  • 09:03: We’ve just witnessed the potential power of this principle.

2019-11-11: Does Life Need a Multiverse to Exist?

  • 16:33: ... that's actually the case. But whether or not it's the case, being a rare potential progenitor of galactic civilization, seems like such a huge ...

2019-11-04: Why We Might Be Alone in the Universe

  • 03:05: ... notes the apparent contradiction between the massive abundance of potential opportunities for technical life to have emerged and spread through our ...
  • 03:19: Now, we’ve talked about the Fermi Paradox before, and some potential solutions.
  • 04:53: ... billions of potential starting points for life in the Milky Way alone, even if we restrict ...

2019-09-16: Could We Terraform Mars?

  • 02:34: In the imaginations of sci-fi writers all we need to do is unlock the planet’s latent potential.

2019-08-19: What Happened Before the Big Bang?

  • 03:11: This self interaction gives the field some potential energy.
  • 03:15: ... potential energy because the field would much rather reconfigure itself into a ...
  • 03:27: Although scalar fields are the simplest, they can exhibit complicated relationships between this potential energy and the field strength.
  • 03:43: Guth's idea is that there's a local minimum in potential energy that allows the inflaton field to get stuck in a false vacuum state.
  • 03:54: When that state decays, potential energy is released as real particles, ending inflation, and re-heating the universe in an expanding bubble.
  • 04:35: ... is that the inflaton field isn't stuck at a local minimum in the potential but rather it's on a very weakly sloping plateau leading towards a ...
  • 05:41: Before we get to that, I want a quick word on why the Inflaton field should have one potential energy curve over any other.
  • 06:23: Very flat potential energy slopes are also possible in these theories, enabling slow roll inflation or a combination of both.
  • 06:54: As the inflaton field rolls down the potential energy hill, the field strength should fluctuate slightly.
  • 08:06: ... and a rare strong fluctuation would force the inflaton field back up the potential energy slope, causing inflation to last a lot longer in that ...
  • 12:39: ... very first speck of space-time and energy came from but it does give a potential explanation for the 'bang' part of the Big ...

2019-08-06: What Caused the Big Bang?

  • 06:14: ... we graph a quantum field potential energy versus field strength, it might look something like this: If the ...
  • 06:42: I'm gonna have to save the how and why of these potential energy curves for another video.
  • 07:54: It would have to get over this potential energy barrier to do that.

2019-07-01: Thorium and the Future of Nuclear Energy

  • 02:49: ... required for water-cooled reactors add a lot of complexity and size and potential to explode Perhaps the worst downside of the common modern reactor is ...

2019-04-03: The Edge of an Infinite Universe

  • 15:16: ... week we enjoyed another potential end of the universe when we talked about the Big Rip - in which space ...
  • 17:01: ... conserved and that dark energy is created from the increasing negative potential energy of the cosmic gravitational field, but I think at that level this ...

2019-03-28: Could the Universe End by Tearing Apart Every Atom?

  • 01:55: ... might not be so safe from dark energy after all but before we get to the potential disaster of an increasing dark energy and the big rip that follows let's ...

2019-03-20: Is Dark Energy Getting Stronger?

  • 12:34: It’s a potential end of the universe in which space-time rips itself to shreds at subatomic scales due to the increasing strength of dark energy.
  • 12:43: Before you dust off your “end-is-nigh” sandwich board a couple of things: 1) any potential Big Rip is tens of billions of years away.

2019-01-30: Perpetual Motion From Negative Mass?

  • 11:52: ... to exotic matter, and it also means flipping the sign of its kinetic and potential ...

2018-12-06: Did Life on Earth Come from Space?

  • 00:37: ... fungal spores were sent on a stratospheric balloon ride since then every potential Pants permeating life-form has taken rides on various satellites most ...

2018-10-25: Will We Ever Find Alien Life?

  • 17:25: He was struck by the potential of multi-dimensional Pringles to unify string theory.

2018-08-01: How Close To The Sun Can Humanity Get?

  • 13:36: Remember, Maxwell's demon is just a metaphor for many potential types of physical gate.

2018-07-25: Reversing Entropy with Maxwell's Demon

  • 10:16: There are more potential outcomes in the former, so more uncertainty has been eliminated when the die is cast.

2018-07-11: Quantum Invariance & The Origin of The Standard Model

  • 07:14: Well, it's something we call a vector potential.
  • 07:27: It looks exactly like the type of vector potential that you would have in the presence of an electromagnetic field.

2018-06-27: How Asteroid Mining Will Save Earth

  • 03:43: All asteroid types have the potential to be profitable.
  • 08:45: It was one of the few missions that had a clear track to massive potential profits and saving the planet from asteroid impact.

2018-05-23: Why Quantum Information is Never Destroyed

  • 05:19: ... function in any given environment, or in quantum speak, in any given potential. ...
  • 05:36: ... principle, a given wave function in a given potential could mean the wave function of an electron moving in an atom's electric ...

2018-05-16: Noether's Theorem and The Symmetries of Reality

  • 05:33: ... energy conservation by incorporating the entire universe's gravitational potential energy to offset the seeming gains or losses to redshift in dark ...

2018-04-25: Black Hole Swarms

  • 06:18: These were potential X-ray binaries, but there are other astrophysical critters that also shine bright in X-rays.

2018-03-21: Scientists Have Detected the First Stars

  • 06:41: To answer this, we need to know how much of the counterweights starting potential energy ends up in the projectile.
  • 06:58: It has no kinetic energy, and so, all of its energy is in potential energy.
  • 07:03: So the energy it lost to the projectile, is just the difference between these potential energies.
  • 07:15: ... don't know anything about the kinetical potential energies at the moment of release, but we do know that the final ...
  • 08:07: Then, subtract the potential energy of the projectile at its point of impact, and we have its kinetic energy.

2018-03-07: Should Space be Privatized?

  • 04:28: Asteroid mining seems likely to drive the next wave of private enterprise, because the potential profits are astronomical.

2018-02-28: The Trebuchet Challenge

  • 01:59: ... or lost by traveling between two points, then we can keep track of the potential for future gains or losses of ...
  • 02:11: We do this by defining this thing called potential energy.
  • 02:14: ... the right way, the sum of kinetic and potential energy, or motion and potential for motion, remains constant, and not ...
  • 02:35: Kinetic and potential energy are defined as combinations of more basic quantities, for example, position, velocity, and mass.
  • 03:37: ... trebuchet is incredibly efficient at converting the potential energy of a massive counterweight into the castle-destroying kinetic ...
  • 05:04: The law of conservation of energy tells us that the sum of kinetic and potential energies of the projectile and the counterweight are conserved.

2018-02-21: The Death of the Sun

  • 09:44: ... particles are close together versus when they're far apart due to the potential energy between them being ...
  • 10:06: ... together than far apart, because close together they have a lot of potential energy, a lot of potential to repel each ...
  • 10:28: And they lose an enormous amount of potential energy when that happens.
  • 10:40: Does this mean that the combined system of the Earth plus you gains mass every time you jump, because you gain potential energy?
  • 10:50: william41017 asks, succinctly, potential relative to what?
  • 10:55: Well, that's a great question, because potential energy is relative.
  • 11:21: But potential energy doesn't have an absolute zero point.
  • 11:36: The difference in potential energy due to any fall would still be the same.

2018-02-14: What is Energy?

  • 00:10: You have so much potential.
  • 02:20: When she introduced the idea of gravitational potential energy, she put the laws of conservation of energy and momentum on equal footing.
  • 02:47: ... example, du Chatelet's gravitational potential energy, mass times the gravitational acceleration times height, is just ...
  • 03:40: Gravitational potential energy gets converted to kinetic energy in the fall and then back to exactly the same amount of potential energy in the rise.
  • 03:49: Sure, energy is conserved but only if we define kinetic and potential energy in the right way.
  • 04:03: And the key is this reversibility in the conversion between kinetic and potential energy.
  • 04:28: ... the field and then retraces its path, the conversion between kinetic and potential energy will happen in ...
  • 04:42: As long as the ball ends up back where it started, it will always have the same combination of kinetic and potential energy as when it left.
  • 04:53: ... field, it will always experience the same conversion between potential and kinetic energy, no matter what path it ...
  • 05:07: ... field takes the same amount of work, the same shift between kinetic and potential ...
  • 05:17: You trade with perfect efficiency between motion and the potential for motion.
  • 06:02: If we account for every particle and field involved, then the transaction between kinetic and potential energy is a zero sum game.
  • 06:25: ... including the entire ball-Earth system when we add in gravitational potential energy, because that energy is stored in the Earth's gravitational ...
  • 06:35: ... we even need to account for the potential energy in the forces that bind subatomic particles together, the energy ...
  • 07:42: ... the flow of fluids by demanding the conservation of the kinetic and potential energy of the fluid and also of the internal energy due to fluid ...
  • 07:56: ... its simplest form, follows the evolving difference between kinetic and potential ...
  • 10:53: ... in the context of Einstein's general theory of relativity due to the potential time evolution of ...

2017-12-20: Extinction by Gamma-Ray Burst

  • 07:10: The nearest potential GRB in the brewing is 8,000 light years away, so within the danger zone.
  • 12:44: Timothy Judge points out a significant potential error in the paper by Portegies Zwart and collaborators.

2017-11-29: Citizen Science + Zero-Point Challenge Answer

  • 04:19: ... goal is to search beyond Neptune for the potential ninth planet, as well as looking for brown dwarfs-- cool, faint, failed ...

2017-10-11: Absolute Cold

  • 08:26: ... in Space Time Journal Club, we talked about the new observation of a potential pair of binary supermassive black holes orbiting only one light year ...

2017-09-28: Are the Fundamental Constants Changing?

  • 08:43: And there are many other potential systematic errors the could masquerade as a change in the fine structure constant.
  • 08:50: These potential pitfalls are why it's so important for scientific experiments to be reproduced by multiple teams before results can be accepted.

2017-08-16: Extraterrestrial Superstorms

  • 04:37: As they contract, gas giants convert gravitational potential energy into heat, which in turn powers the largest storms in the solar system.

2017-07-19: The Real Star Wars

  • 07:19: The treaty is now ratified by 107 nations and seriously limits the potential for nuclear space war.
  • 11:58: There is a potential new arms race threatening.

2017-07-07: Feynman's Infinite Quantum Paths

  • 04:51: It's proportional to both the transfer between kinetic and potential energy over a path and the travel time.

2017-05-17: Martian Evolution

  • 06:09: There are many potential adaptations to low oxygen environments.

2017-05-03: Are We Living in an Ancestor Simulation? ft. Neil deGrasse Tyson

  • 10:51: Another big issue is just the potential for spectacular overreach in using these Copernican and entropic arguments.

2017-04-05: Telescopes on the Moon

  • 01:18: That means-- one, the potential for extreme image sharpness with no turbulence to blow light from above.
  • 10:52: You could transform the gravitational potential energy of things falling towards the event horizon into usable energy.
  • 11:09: ... converts gravitational potential energy into kinetic energy but that kinetic energy is only positive ...

2017-01-19: The Phantom Singularity

  • 13:48: You shouldn't mistake media and internet hype for actual potential.

2017-01-11: The EM Drive: Fact or Fantasy?

  • 06:25: ... authors identify several other potential sources of false positive signal, and either make reasonable arguments ...

2016-12-08: What Happens at the Event Horizon?

  • 15:42: This uncertainty leads to the range of potential future trajectories, including trajectories through one slit or the other.

2016-09-14: Self-Replicating Robots and Galactic Domination

  • 12:12: Mr. Mercury is a little uncomfortable with building a power source that has the potential to destroy our solar system.

2016-08-03: Can We Survive the Destruction of the Earth? ft. Neal Stephenson

  • 06:02: Any asteroid or comet bigger than a few kilometers diameter has the potential to cause extreme climate change and mass extinction.
  • 07:21: Do we trust them to keep a constant watch on the heavens, on global volcanic activity, and on potential threats from the biosphere?

2016-07-20: The Future of Gravitational Waves

  • 07:03: ... needed to calculate how far from the center of the nucleus, the Coulomb potential of the nuclear protons, reaches the 8.78 mega electron volts of the ...

2016-06-29: Nuclear Physics Challenge

  • 03:34: That happens when the potential energy of the cooling force trying to drive it away from the nucleus is equal to the kinetic energy of the particle.

2016-06-15: The Strange Universe of Gravitational Lensing

  • 10:18: Think about that alpha particle trying to tunnel through the potential energy wall of the strong nuclear force.

2016-06-01: Is Quantum Tunneling Faster than Light?

  • 03:19: We can imagine an alpha particle as being like a ball trapped in a steep valley of potential energy.

2016-05-25: Is an Ice Age Coming?

  • 14:12: ... perspective requires the invention of a new quantity-- gravitational potential energy-- in order to preserve energy ...

2016-04-13: Will the Universe Expand Forever?

  • 03:14: As the apple rises, its kinetic energy, its energy of motion, is sapped by the gravitational field and converted into potential energy.
  • 05:17: It reflects the same balance between kinetic and gravitational potential energy that we saw in our rising apple.
  • 05:53: So this second piece represents the capacity of the universe to slow itself down and is analogous to the gravitational potential energy.
  • 06:09: ... the kinetic energy of expansion and the potential energy of collapse are perfectly balanced, then the universe will expand ...

2016-02-17: Planet X Discovered?? + Challenge Winners!

  • 00:16: This is a potential near-Nepture sized planet.

2016-01-06: The True Nature of Matter and Mass

  • 05:08: ... binding gluon field, which itself acts like a compressed spring, holding potential ...

2015-12-16: The Higgs Mechanism Explained

  • 08:21: Casterverus would like to know if the potential event horizon that we talk about is the same thing as the Schwarzschild radius.

2015-12-09: How to Build a Black Hole

  • 06:17: If one is tightly constrained, then the other must be uncertain and span a wide range of potential values.
  • 07:58: And yet, below the star's surface, their lurks the potential event horizon, the surface of infinite time dilation.

2015-11-18: 5 Ways to Stop a Killer Asteroid

  • 03:30: But what about the NEOs the size of the Chelyabinsk or Tunguskia rocks, Potential city killers.
  • 08:53: Now this may well eliminate a number of potential galactic empires.

2015-08-27: Watch THIS! (New Host + Challenge Winners)

  • 04:07: And the effective potential formulation for radio [INAUDIBLE].

2015-05-27: Habitable Exoplanets Debunked!

  • 06:50: If everyone on Earth picked up a hammer at the same time, by how much would Earth's mass increase due to the excess gravitational potential energy?
  • 07:01: ... more gravitational potential energy in the hammers, but that was previously stored as chemical energy ...
  • 08:41: ... there's a configuration in which something has less total potential energy than it did before, then that configuration will have less mass, ...
  • 08:50: Sometimes you have less total potential energy by putting things together.
  • 08:54: Sometimes there's less potential and kinetic energy if you pull things apart.

2015-05-20: The Real Meaning of E=mc²

  • 01:42: ... are also wound up springs in the running watch that have potential energy, and there's a little bit of friction between the moving parts of ...
  • 01:59: ... M equals E over c squared says is that all of that kinetic energy and potential energy and thermal energy that resides in the watch's parts manifests ...
  • 02:11: ... speed of light squared, and that's how much extra mass the kinetic and potential and thermal energies of the parts contribute to the ...
  • 04:10: All the energy in sunlight came at the expense of other energy, kinetic and potential energy, of the particles that make up the sun.
  • 04:17: ... that light was emitted, there was simply more kinetic and potential energy contained within the volume of the sun manifesting as part of the ...
  • 04:25: Those 4 billion kilograms that the sun loses every second is really a reduction in the kinetic and potential energies of its constituent particles.
  • 05:29: It's because potential energy can be negative.
  • 05:32: Suppose we call the potential energy of a proton and electron zero when they're infinitely far apart.
  • 05:37: ... they attract each other, their electric potential energy will drop when they get closer together, just like your ...
  • 05:48: So the potential energy of the electron and proton in a hydrogen atom is negative.
  • 05:58: ... as it turns out, the potential energy is negative enough that the sum of the kinetic and potential ...
  • 06:22: ... weighs less than two oxygen atoms because the combined kinetic and potential energies of those atoms once they form a chemical bond is ...
  • 06:41: Basically, quark potential energy.
  • 06:48: Every time he says "gluons" in that video, just substitute "quark potential energy," and you'll have a roughly correct picture of what's going on.
  • 07:05: Well, that's a subtle question, but crudely speaking, you can think even of this mass as being a reflection of various kinds of potential energies.
  • 07:12: For instance, there's the potential energy associated with the interactions of electrons and quarks with the Higgs field.
  • 07:17: ... there's also potential energy that electrons and quarks have from interacting with the electric ...
  • 07:34: There's a way to conceptualize even this process as simple conversions of one kind of energy to another-- kinetic, potential, light, and so forth.
  • 08:35: ... second configuration has more gravitational potential energy than the first because the second block is higher up, so it will ...

2015-04-15: Could NASA Start the Zombie Apocalypse?

  • 00:09: Today, I want to discuss a potential back story that's less ridiculous than it sounds.

2015-03-04: Should We Colonize Venus Instead of Mars?

  • 07:11: What the Hubble Bubble offers is a potential alternative to the currently observed, accelerated expansion of space.
97 result(s) shown.