Search PBS Space Time

What are you looking for?

	2022-11-23: How To See Black Holes By Catching Neutrinos 02:18: ... interaction probability most of them pass straight through your detector. ... 03:01: To have a chance of catching a neutrino you need a big detector, and the biggest neutrino detector is IceCube. 04:53: The actual detectors are sensitive photomultipliers - basically extremely sensitive light detectors - suspended in deep boreholes. 11:47: ... are already plans to improve the sensitivity of IceCubes detectors, and also to expand it to a full 10 cubic kilometers, which should ... 12:01: ... which allows us to scan vast tracks of the Antarctic glacier with detectors placed above the ... 04:53: The actual detectors are sensitive photomultipliers - basically extremely sensitive light detectors - suspended in deep boreholes. 11:47: ... are already plans to improve the sensitivity of IceCubes detectors, and also to expand it to a full 10 cubic kilometers, which should ... 12:01: ... which allows us to scan vast tracks of the Antarctic glacier with detectors placed above the ... 04:53: The actual detectors are sensitive photomultipliers - basically extremely sensitive light detectors - suspended in deep boreholes.
	2022-11-16: Are there Undiscovered Elements Beyond The Periodic Table? 15:18: Americium is critical for smoke detectors - so it’s an artificial element that has saved many lives.
	2022-10-12: The REAL Possibility of Mapping Alien Planets! 15:45: ... observations just turn on one or more of the telescope’s other detectors. These collect data   a little off the field of the primary ...
	2022-09-14: Could the Higgs Boson Lead Us to Dark Matter? 02:50: ... particle is actually interacted with one of the particles in our say detector. ... 03:14: So dark matter detectors consist of huge tubs of liquid or massive chunks of crystal, placed deep underground to avoid cosmic rays. 03:24: ... either our detectors aren’t big enough or we haven’t waited long enough, because we have yet ... 05:21: Those particles are sometimes detected directly when they smash into one of the many detectors surrounding the collision point. 08:20: After all, those particles are going to fly right through all of our detectors. 09:11: If total momentum seems to have decreased, this implies something invisible has sneaked that missing momentum past the detectors. 10:13: ... the right to balance it out. Here’s a real-life example from the ATLAS detector at the LHC: this event has caused a jet of various visible particles to ... 03:14: So dark matter detectors consist of huge tubs of liquid or massive chunks of crystal, placed deep underground to avoid cosmic rays. 03:24: ... either our detectors aren’t big enough or we haven’t waited long enough, because we have yet ... 05:21: Those particles are sometimes detected directly when they smash into one of the many detectors surrounding the collision point. 08:20: After all, those particles are going to fly right through all of our detectors. 09:11: If total momentum seems to have decreased, this implies something invisible has sneaked that missing momentum past the detectors. 03:14: So dark matter detectors consist of huge tubs of liquid or massive chunks of crystal, placed deep underground to avoid cosmic rays. 05:21: Those particles are sometimes detected directly when they smash into one of the many detectors surrounding the collision point.
	2022-06-22: Is Interstellar Travel Impossible? 16:52: ... we are asking one of the two questions: "what's your phase?" and "which detector did you go to?" Framed as yes/no ... 17:09: ... (for example the phase), or about the particle-like properties (which detector), but not both at the same time with the same ...
	2022-05-04: Space DOES NOT Expand Everywhere 13:50: ... particle collider it travels through the powerful magnetic fields of the detector. The amount by which its path is deflected by that field depends on its ...
	2022-04-20: Does the Universe Create Itself? 05:56: ... we add a pair of detectors we see that each photon randomly arrives in detector 1 or detector ... 06:24: ... scramble the beams so that we don’t know which path brings the photon to detectors 1 versus 2. Now detector 1 always registers a photon and detector 2 ... 05:56: ... we add a pair of detectors we see that each photon randomly arrives in detector 1 or detector 2, revealing whether it was transmitted or reflected by ... 06:24: ... we don’t know which path brings the photon to detectors 1 versus 2. Now detector 1 always registers a photon and detector 2 never does. Why? Well if the ... 05:56: ... of detectors we see that each photon randomly arrives in detector 1 or detector 2, revealing whether it was transmitted or reflected by the beamsplitter. But ... 06:24: ... scramble the beams so that we don’t know which path brings the photon to detectors 1 versus 2. Now detector 1 always registers a photon and detector 2 ...
	2022-02-23: Are Cosmic Strings Cracks in the Universe? 10:09: ... observatories. These are likely too weak to be seen at our current detectors such as LIGO,   but future detectors such as LISA might ...
	2022-02-16: Is The Wave Function The Building Block of Reality? 02:24: ... So how far can the superposition extend? The atom, the radioactive detector, the vial of poison, the cat, the ...
	2021-11-02: Is ACTION The Most Fundamental Property in Physics? 08:39: ... at a barrier with two slits cut in it. When the stream reaches a detector screen on the other side the individual particles make individual spots, ...
	2021-09-21: How Electron Spin Makes Matter Possible 16:27: ... amateur telescope with an admittedly ridiculously expensive digital detector and spectrograph could take a spectrum of a bright quasar and see the ...
	2021-07-13: Where Are The Worlds In Many Worlds? 05:06: ... we try to measure the final location of the electron on a detector screen, we find that we’re more likely to see it where the wavefunction ... 05:59: The wavefunction of the electron joins the wavefunction of the detector screen at all points, rippling onwards. 06:37: ... the wavefunction ripples through the detector, along wires, through computer circuitry, as photons from the screen, as ... 07:36: Even prior to hitting the detector screen, we still had many worlds - or at least the seeds of them. 08:08: But imagine you placed detector devices in front of those slits to measure which slit the electron passed though. 08:28: ... the detectors you still have two parts of the same electron’s wavefunction, but now ... 08:08: But imagine you placed detector devices in front of those slits to measure which slit the electron passed though. 05:06: ... we try to measure the final location of the electron on a detector screen, we find that we’re more likely to see it where the wavefunction is high ... 05:59: The wavefunction of the electron joins the wavefunction of the detector screen at all points, rippling onwards. 07:36: Even prior to hitting the detector screen, we still had many worlds - or at least the seeds of them. 08:28: ... the detectors you still have two parts of the same electron’s wavefunction, but now ...
	2021-07-07: Electrons DO NOT Spin 06:10: ... might expect a blur of points where the  silver atoms hit the detector screen - some deflected up or down by the maximum, but most  ... 06:36: ... to the field would experience no force whatsoever. But if we put our detector screen we see that the atoms again land in two spots - now also oriented ... 06:10: ... might expect a blur of points where the  silver atoms hit the detector screen - some deflected up or down by the maximum, but most  deflected ... 06:36: ... to the field would experience no force whatsoever. But if we put our detector screen we see that the atoms again land in two spots - now also oriented ... 06:10: ... might expect a blur of points where the  silver atoms hit the detector screen - some deflected up or down by the maximum, but most  deflected ...
	2021-06-16: Can Space Be Infinitely Divided? 03:14: ... You shine a laser beam at   it, which reflects back to a detector that records the light travel time, which also gives you ...
	2021-05-25: What If (Tiny) Black Holes Are Everywhere? 13:36: ... be gamed to improve measurements - in particular in gravitational wave detectors. ...
	2021-02-17: Gravitational Wave Background Discovered? 00:00: ... taken it to the next level with a galaxy spanning gravitational wave detector that may have detected a foundational element of space itself the ...
	2020-08-10: Theory of Everything Controversies: Livestream 00:00: ... gravity may that be this big collider or you have to build a graviton detector the size of the planet jupiter and put it in orbit around the neutron ...
	2020-02-24: How Decoherence Splits The Quantum Multiverse 10:20: The electrons in the detector and in the circuits will be at different locations and will have different energies. 10:52: ... histories to merge again - just like when we cut new slits into the detector ...
	2020-02-18: Does Consciousness Influence Quantum Mechanics? 02:04: It goest like this: A single electron is shot at a pair of slits. It passes through and is registered on a detector screen on the other side. 03:20: ... destinations for the electron to a more or less definite spot on the detector ... 03:56: ... electron wavefunction passes through both slits, reaches the electronic detector, and there it excites a second electron somewhere on the detector ... 04:36: ... call this chain of information between the detector and the mind a von Neumann chain, after the great Hungarian-American ... 04:56: Probably not as soon as our electron wavefunction reaches the detector. 04:59: The first electron to become excited in the detector is also a quantum object. 05:14: ... of states: a wavefunction in which an electron at every location on the detector screen is simultaneously excited and not ... 05:34: But all of these things are made of atoms - the “von Neumann chain” from detector to mind is a chain of quantum objects. 06:35: You know the experiment has been completed with a single photon reaching the detector, and your friend is aware of the result, but you are not. 11:18: A single electron reaches the detector screen and you both learn its location at the same time. 12:32: ... multiple alternate histories after the electron wavefunction reaches the detector - and why these histories stop communicating with each ... 02:04: It goest like this: A single electron is shot at a pair of slits. It passes through and is registered on a detector screen on the other side. 03:20: ... destinations for the electron to a more or less definite spot on the detector screen. ... 03:56: ... detector, and there it excites a second electron somewhere on the detector screen. ... 05:14: ... of states: a wavefunction in which an electron at every location on the detector screen is simultaneously excited and not ... 11:18: A single electron reaches the detector screen and you both learn its location at the same time.
	2020-02-11: Are Axions Dark Matter? 08:58: ... things. So the Sun’s core may spew out countless axions. CAST forms the detector part of the apparatus and uses strong magnetic fields of its own to try ...
	2020-01-20: Solving the Three Body Problem 14:17: Gede Ge asks why we use argon in our neutrino detectors, and that’s a great question. 14:24: ... answer is that we don’t always. Neutrino detectors have been made of water, metal, dry cleaning fluid, even baby oil doped ... 14:17: Gede Ge asks why we use argon in our neutrino detectors, and that’s a great question. 14:24: ... answer is that we don’t always. Neutrino detectors have been made of water, metal, dry cleaning fluid, even baby oil doped ...
	2020-01-06: How To Detect a Neutrino 02:25: ♪ ♪ But in order to have a chance at spotting even one single neutrino, ♪ ♪ a truly enormous number needs to reach the detector. 03:20: ... into an almost pure beam of muon neutrinos ♪ ♪ ready to be sent to our detector. ... 03:33: ... Argon Neutrino Hunter" ♪ ♪ MATT: Down here, we have the ICARUS neutrino detector. ... 03:52: ... so what we do is we shoot 10 trillion neutrinos per second through this detector, ♪ ♪ and only a handful of them actually ... 05:37: ... ♪ DR. DON: And if a neutrino interacts in our detector, ♪ ♪ an Argon nucleus is broken apart and charged particles are released ... 05:52: ♪ ♪ We charge the sides of the detector, so a giant electric field fills the entire tank. 07:04: ... ♪ ♪ 1,300 kilometers from Chicago to South Dakota, where ♪ ♪ a huge detector weighing 70,000 tons ♪ ♪ consisting of liquid argon and located a mile ...
	2019-01-16: Our Antimatter, Mirrored, Time-Reversed Universe 02:02: ... detector is placed to intercept those electrons and the clock ticks with every ... 03:02: ... this by sending a bunch of both types of neutral Kaon down a tube with a detector at the far end. The KS particles should never have made the journey ...
	2018-11-21: 'Oumuamua Is Not Aliens 16:21: Hiccup Haddock asks, why ice, as in why does IceCube use photon detectors in ice instead of any other material. 16:41: That radiation travels a short distance through ice to the nearest photon detector. 16:53: Liquid water is common, for example in the Super-Kamiokande neutrino detector in Japan. 16:21: Hiccup Haddock asks, why ice, as in why does IceCube use photon detectors in ice instead of any other material.
	2018-11-14: Supersymmetric Particle Found? 04:40: In fact, it's a cosmic ray detector disguised as a neutrino detector disguised as a radio antenna disguised as a hot air balloon. 05:45: For example, the IceCube Observatory is a one kilometer cube of the Antarctic glacier laced with photon detectors. 06:04: And IceCube's photo detectors track these flashes. 04:40: In fact, it's a cosmic ray detector disguised as a neutrino detector disguised as a radio antenna disguised as a hot air balloon. 05:45: For example, the IceCube Observatory is a one kilometer cube of the Antarctic glacier laced with photon detectors. 06:04: And IceCube's photo detectors track these flashes.
	2018-10-03: How to Detect Extra Dimensions 09:41: All you need is a billion-dollar network of gravitational wave detectors and a way to independently measure the distance the wave traveled.
	2018-08-01: How Close To The Sun Can Humanity Get? 03:47: There's the field experiment, which is essentially, a magnetometer and voltage detector.
	2018-07-04: Will A New Neutrino Change The Standard Model? 08:45: That was the Liquid Scintillator Neutrino Detector, LSND, experiment at Los Alamos, which in 2001 published a 3.8-sigma excess in electron neutrinos. 09:38: ... IceCube neutrino detector in Antarctica has found no evidence of the existence of sterile ... 08:45: That was the Liquid Scintillator Neutrino Detector, LSND, experiment at Los Alamos, which in 2001 published a 3.8-sigma excess in electron neutrinos.
	2018-04-25: Black Hole Swarms 11:16: ... rogue wolf notes, that stellar gravitational wave detectors, like pulsar timing arrays, are a bit like using the rustling of leaves ...
	2018-04-18: Using Stars to See Gravitational Waves 06:58: He came up with a thought experiment of a simple gravitational wave detector, a rod with two sliding beads.
	2018-04-11: The Physics of Life (ft. It's Okay to be Smart & PBS Eons!) 11:07: ... from the point of view of an inertial observer, an accelerating particle detector emits particles instead of absorbing ... 11:23: ... in short, the inertial observer sees the accelerating particle detector click as though it registered a particle, but the excitation behind that ... 11:07: ... from the point of view of an inertial observer, an accelerating particle detector emits particles instead of absorbing ...
	2018-04-04: The Unruh Effect 07:37: A little less gruesomely, imagine the Rindler observer has a particle detector. 07:41: Every time an Unruh particle hits the detector, it would click. 07:55: The proof uses something called an Unruh-DeWitt detector. 08:15: So as the detector accelerates, Unruh particles appear. 08:19: The detector particle gets excited by an Unruh particle, causing the detector to click. 08:29: Well, they also see the accelerating detector click, but they argue that it's for a very different reason. 08:36: ... field theory calculation to understand the coupling between the detector particle and the field, they get that there's a sort of drag or friction ... 08:51: That causes energy to be dumped into the detector particle. 08:15: So as the detector accelerates, Unruh particles appear. 08:29: Well, they also see the accelerating detector click, but they argue that it's for a very different reason. 08:19: The detector particle gets excited by an Unruh particle, causing the detector to click. 08:36: ... field theory calculation to understand the coupling between the detector particle and the field, they get that there's a sort of drag or friction turn ... 08:51: That causes energy to be dumped into the detector particle.
	2017-09-28: Are the Fundamental Constants Changing? 14:18: So this material would have to be cone-shaped so the smaller rings are closer to the detector.
	2017-09-20: The Future of Space Telescopes 06:08: Imagine an opaque disk of 100 meters to a kilometer in diameter, suspended in front of a satellite detector. 08:10: In this case, the disk would have to sit thousands of kilometers in front of the detector.
	2017-04-19: The Oh My God Particle 02:18: Theodore Wulf first noticed this in 1909 when he took a detector to the top of the Eiffel Tower. 02:24: But the real proof came a few years later in 1912 when Victor Hess took some of Wulf's detectors on a hot air balloon ride. 04:44: It still uses upgraded fluorescence telescopes and has added scintillation detectors on the ground. 02:24: But the real proof came a few years later in 1912 when Victor Hess took some of Wulf's detectors on a hot air balloon ride. 04:44: It still uses upgraded fluorescence telescopes and has added scintillation detectors on the ground.
	2017-02-15: Telescopes of Tomorrow 04:12: Webb's detectors will be cooled with cryogenics to a frigid 50 Kelvin or minus 223 degrees Celsius.
	2016-10-26: The Many Worlds of the Quantum Multiverse 01:09: But to summarize, a stream of photons or electrons, or even molecules, travels from some point to a detector screen via pair of slits.
	2016-09-07: Is There a Fifth Fundamental Force? + Quantum Eraser Answer 04:55: ... path until you compare the results of the screen with the results at the detector. ... 05:15: It's only when you flag which photons had twins arriving at detectors A, B, C, or D that you see patterns arise. 06:09: Yet, we can't extract the patterns of the photons that landed at the screen until we get the information of which detectors their entangled twins hit. 07:19: If either detectors A or B are triggered, then there's an asymmetry in the global wave function, passing through one slit versus the other. 05:15: It's only when you flag which photons had twins arriving at detectors A, B, C, or D that you see patterns arise. 06:09: Yet, we can't extract the patterns of the photons that landed at the screen until we get the information of which detectors their entangled twins hit. 07:19: If either detectors A or B are triggered, then there's an asymmetry in the global wave function, passing through one slit versus the other.
	2016-08-24: Should We Build a Dyson Sphere? 11:57: ... resolve the photon distributions at the screen, you need to know which detector was triggered by every one of those photon's entangled ... 12:11: ... right time offset between a hit on the screen and a hit at one of the detectors, that means that those two photons were an entangled ... 12:21: ... pick out off the screen all of the photons that had twins hitting, say, detector A. Those photons turn out to show no interference ... 12:38: ... there is no way to figure out which photons correspond to which detectors until the arrival times at the screen are compared to the arrival times ... 13:09: But we can't extract that information until those future events have occurred, and we can compare notes between the screen and detectors. 13:24: ... the interference screen looks like before you know what the data is at detectors A, B, C, and D. Well, the screen just looks like a blur of ... 13:37: You see, it's not just that the blur of photons connected to detectors A and B are overlaid with an interference pattern from C and D, no. 12:11: ... right time offset between a hit on the screen and a hit at one of the detectors, that means that those two photons were an entangled ... 12:38: ... there is no way to figure out which photons correspond to which detectors until the arrival times at the screen are compared to the arrival times ... 13:09: But we can't extract that information until those future events have occurred, and we can compare notes between the screen and detectors. 13:24: ... the interference screen looks like before you know what the data is at detectors A, B, C, and D. Well, the screen just looks like a blur of ... 13:37: You see, it's not just that the blur of photons connected to detectors A and B are overlaid with an interference pattern from C and D, no.
	2016-08-17: Quantum Eraser Lottery Challenge 01:08: When the researchers conducted this experiment, they didn't bother with detector B. There were really only two sets of possible outcomes. 01:16: One-- a photon finds its way to detector A. In that case, we know the original photon must have passed through slit A. 01:24: Or two, either detector C or D fire, in which case we have no idea which slit was traversed. 03:06: First, let's bring back detector B. We don't really need it, but it makes the explanation simpler. 03:11: ... it was executed, photons can travel to the "which way" section-- so detectors A and B-- or to the "eraser" section-- so C and D. That choice is made ... 03:34: With the mirrors in place, photons are reflected to the which way detectors, and no interference pattern is formed. 03:11: ... it was executed, photons can travel to the "which way" section-- so detectors A and B-- or to the "eraser" section-- so C and D. That choice is made ... 03:34: With the mirrors in place, photons are reflected to the which way detectors, and no interference pattern is formed.
	2016-08-10: How the Quantum Eraser Rewrites the Past 01:52: ... is better at collapsing wave functions then observation by an electronic detector. ... 03:01: ... is even true if you place detectors on the far side of the slits after the wave particle thing should have ... 05:11: Let's focus on detectors A and B here. 05:14: Detector A lights up if the original photon passed through slit A. And detector B lights up for slit B. 05:21: If we run this for a bunch of photons, we see that whenever detectors A or B light up, we get a simple pile of photons here at the screen. 05:54: And then later, its untangled partner reaches detector A or B, and somehow retroactively influences the previous landing position. 06:50: Instead of being reflected to detectors A or B, half of the photons end up in detectors C or D. 07:06: If we only look at the photons whose twins end up at detector C or D, we do see an interference pattern. 03:01: ... is even true if you place detectors on the far side of the slits after the wave particle thing should have ... 05:11: Let's focus on detectors A and B here. 05:21: If we run this for a bunch of photons, we see that whenever detectors A or B light up, we get a simple pile of photons here at the screen. 06:50: Instead of being reflected to detectors A or B, half of the photons end up in detectors C or D.
	2016-07-20: The Future of Gravitational Waves 01:46: Also, the same signal was seen in the two LIGO detectors located in Livingston, Louisiana and Hanford, Washington. 05:10: ... which is determined by the time difference in the signal between the two detectors. ... 01:46: Also, the same signal was seen in the two LIGO detectors located in Livingston, Louisiana and Hanford, Washington. 05:10: ... which is determined by the time difference in the signal between the two detectors. ... 01:46: Also, the same signal was seen in the two LIGO detectors located in Livingston, Louisiana and Hanford, Washington.
	2016-07-06: Juno to Reveal Jupiter's Violent Past 11:19: A more color sensitive eye or electronic detector would see the sun as yellowish green.
	2016-06-08: New Fundamental Particle Discovered?? + Challenge Winners! 01:42: And some are so hopelessly unstable that they decay into high energy light-- gamma rays-- before they ever reach a detector. 02:34: ... about it except that two completely separate experiments using separate detectors-- Atlas and CMS-- both saw the same ...
	2016-06-01: Is Quantum Tunneling Faster than Light? 06:39: ... through the width of the barrier, then they should arrive at the detector slightly ahead of the photon that travels the unimpeded ...
	2016-05-18: Anti-gravity and the True Nature of Dark Energy 12:20: The signal will be weak, but we'll know exactly where to look and can use gigantic detectors here on Earth.
	2016-05-04: Will Starshot's Insterstellar Journey Succeed? 04:09: ... payload will be a single wafer of electronics and would include multiple detectors, including a camera, small lasers that work both as thrusters and as ...
	2015-09-23: Does Dark Matter BREAK Physics? 07:14: ... have detectors here on Earth designed to catch the fall-out between the unthinkably ...
	2015-07-29: General Relativity & Curved Spacetime Explained! 05:37: Fire a laser pulse from the ground floor of a building up to a photon detector on the roof.

49 result(s) shown.

Help · About · Index