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	2022-11-23: How To See Black Holes By Catching Neutrinos 12:01: ... can also look for neutrino Cherenkov radiation at radio wavelengths, which allows us to scan vast tracks of the Antarctic glacier with ...
	2022-10-12: The REAL Possibility of Mapping Alien Planets! 01:25: ... of the electromagnetic wave  - which gets harder the shorter the wavelength. But there is one way to take a direct image of an exoplanet in ... 15:45: ... no - Hubble was most sensitive at visible  and ultraviolet wavelengths, while JWST is   an infrared scope. These are very ...
	2022-09-28: Why Is 1/137 One of the Greatest Unsolved Problems In Physics? 01:43: ... in the light observed when we break it up into a spectrum of different wavelengths. ... 04:05: ... repulsive energy between two electrons is 137 smaller than a photon with wavelength equal to the  distance between the ... 01:43: ... in the light observed when we break it up into a spectrum of different wavelengths. ...
	2022-09-21: Science of the James Webb Telescope Explained! 03:54: The choice of long wavelength light specializes JWST for a number of particular science goals. 04:40: ... stars, as well as peer through that dust which normally blocks shorter wavelength ... 05:16: ... with sensitivities from visible red light through the slightly longer wavelengths of near-infrared all the way to the much longer wavelength ... 03:54: The choice of long wavelength light specializes JWST for a number of particular science goals. 04:40: ... stars, as well as peer through that dust which normally blocks shorter wavelength light. ... 03:54: The choice of long wavelength light specializes JWST for a number of particular science goals. 05:16: ... longer wavelengths of near-infrared all the way to the much longer wavelength mid-infrared. ...
	2022-05-25: The Evolution of the Modern Milky Way Galaxy 05:11: ... from specific elements sucking up  or producing light at specific wavelengths.   Stars with similar metallicities could have come from the same merger ...
	2022-04-20: Does the Universe Create Itself? 16:10: ... fields in a way that looks like thermal radiation. That radiation has a wavelength that’s on the scale of the event horizon. So the horizon radiation from ...
	2022-03-08: Is the Proxima System Our Best Hope For Another Earth? 03:33: Proxima’s emissions lines seemed to shift back and forth from the wavelengths dictated by the laws of physics. 04:22: ... the wavelengths of all the star’s light are stretched as the star moves away from us and ... 03:33: Proxima’s emissions lines seemed to shift back and forth from the wavelengths dictated by the laws of physics. 04:22: ... the wavelengths of all the star’s light are stretched as the star moves away from us and ... 03:33: Proxima’s emissions lines seemed to shift back and forth from the wavelengths dictated by the laws of physics.
	2022-02-16: Is The Wave Function The Building Block of Reality? 14:52: ... relative size of the black hole and the wave. A gravitational wave whose wavelength is short compared to the black hole’s event horizon can be completely ...
	2022-02-10: The Nature of Space and Time AMA 00:03: ... okay increases the difference between its peaks and increases its wavelength okay uh decreasing its energy but if we calculate what redshift would ...
	2021-12-29: How to Find ALIEN Dyson Spheres 03:05: ... spectrum - light generated by its 6000K surface is distributed at all wavelengths, but it peaks in the visible part of the ... 03:24: ... new thermal spectrum, now at 300 or so Kelvin, with its peak at infrared wavelengths. ... 07:31: Two pure thermal spectra would be stitched into one weird spectrum with too little light at visible wavelengths and too much at infrared wavelengths. 07:41: If we carefully broke up the star’s light with spectrographs spanning a huge wavelength range, we might be able to see two distinct thermal spectra. 08:12: In astronomy, color refers to the ratio of brightnesses at two different wavelengths. 09:20: At visible wavelengths a star’s color might not change much - it’ll just look dimmer. 09:31: But if we measure its colour using an infrared wavelength along with our visible light, we’d find too much of that IR. 07:41: If we carefully broke up the star’s light with spectrographs spanning a huge wavelength range, we might be able to see two distinct thermal spectra. 03:05: ... spectrum - light generated by its 6000K surface is distributed at all wavelengths, but it peaks in the visible part of the ... 03:24: ... new thermal spectrum, now at 300 or so Kelvin, with its peak at infrared wavelengths. ... 07:31: Two pure thermal spectra would be stitched into one weird spectrum with too little light at visible wavelengths and too much at infrared wavelengths. 08:12: In astronomy, color refers to the ratio of brightnesses at two different wavelengths. 09:20: At visible wavelengths a star’s color might not change much - it’ll just look dimmer.
	2021-12-10: 2021 End of Year AMA! 00:02: ... vacuum that sort of are excluded from the plates because of their wavelengths they're excluded from between the plates and so you so you lower the ...
	2021-09-07: First Detection of Light from Behind a Black Hole 02:41: A spectrum, by the way, is what you get when you split light into its component colors or wavelengths. 04:05: ... causing different parts of the disk to brighten - first the shorter wavelength which corresponds to the hot, inner disk, then to longer wavelengths of ... 05:15: In a normal spectrum we see the light from these electron transitions as sharp spikes at specific wavelengths - what we call emission lines. 05:22: But in a quasar, the gas is moving fast, and that motion shifts the wavelengths of the light as we see it. 07:33: Its light is blue-shifted to shorter wavelengths. 07:41: Meanwhile the gas closer to us is actually moving away from us as it falls towards the black hole - it’s redshifted to longer wavelengths. 10:22: We see that iron because it shines at a specific X-ray wavelength - this is the iron K-alpha line. 02:41: A spectrum, by the way, is what you get when you split light into its component colors or wavelengths. 04:05: ... wavelength which corresponds to the hot, inner disk, then to longer wavelengths of the cooler, outer ... 05:15: In a normal spectrum we see the light from these electron transitions as sharp spikes at specific wavelengths - what we call emission lines. 05:22: But in a quasar, the gas is moving fast, and that motion shifts the wavelengths of the light as we see it. 07:33: Its light is blue-shifted to shorter wavelengths. 07:41: Meanwhile the gas closer to us is actually moving away from us as it falls towards the black hole - it’s redshifted to longer wavelengths. 05:15: In a normal spectrum we see the light from these electron transitions as sharp spikes at specific wavelengths - what we call emission lines.
	2021-08-03: How An Extreme New Star Could Change All Cosmology 03:19: ... atom move between orbitals, they emit or absorb light with very specific wavelengths. That tells us what kind of atoms are in the object, but also a lot more. ...
	2021-07-07: Electrons DO NOT Spin 02:25: ... properties of electrons. That came from looking  at the specific wavelengths of photons emitted when electrons jump between energy levels  in ...
	2021-06-16: Can Space Be Infinitely Divided? 03:14: ... wave.   That gives a distance uncertainty of around one wavelength of whatever type of light you’re   using. OK, easy enough - ... 03:47: ... Light carries energy and momentum - and the shorter the   wavelength, the more it carries. If you bombard your object with a powerful ... 04:30: ... momentum of the measured object,   and replace wavelength with uncertainty  in its position. Rearrange and voila,   ... 06:02: ... and who cares about   momentum. We keep decreasing the wavelength of our measuring photon - ultraviolet - X-ray -   ... 06:39: ... in the exact form as the Planck length  squared divided by the wavelength. ... 07:10: ... you pump up the energy of your photon,   reducing its wavelength also reduces the regular Heisenberg uncertainty, but at the same ... 07:48: ... a one-Planck-length   object. You need a photon with a  wavelength smaller than one-Planck-length.   But that photon has enough ... 06:02: ... and who cares about   momentum. We keep decreasing the wavelength of our measuring photon - ultraviolet - X-ray -   gamma-ray - which ... 07:48: ... a one-Planck-length   object. You need a photon with a  wavelength smaller than one-Planck-length.   But that photon has enough effective ... 04:30: ... photon’s momentum is the Planck  constant divided by its wavelength.   So just replace photon momentum with the uncertainty momentum of ... 06:39: ... and the energy of a photon is Planck’s  constant times c^2 over the wavelength.   We have this thing that’s full of our  wonderful fundamental ...
	2021-05-25: What If (Tiny) Black Holes Are Everywhere? 02:52: ... the wavelength of the emitted particles are about the size of the whole event horizon, ... 03:08: ... radiation is just photons - electromagnetic waves with kilometers-long wavelengths, so really, really low energy radio ... 03:25: But as the black hole shrinks in mass and in size, its Hawking radiation also decreases in wavelength - but it increases in energy. 05:13: In that motion they produce thermal radiation that includes every possible wavelength of light. 05:18: But if you zoom in on a single iron atom - it can’t emit every wavelength of light. 03:25: But as the black hole shrinks in mass and in size, its Hawking radiation also decreases in wavelength - but it increases in energy. 03:08: ... radiation is just photons - electromagnetic waves with kilometers-long wavelengths, so really, really low energy radio ...
	2021-03-16: The NEW Crisis in Cosmology 01:16: ... us through the expanding universe it gets  stretched out - its wavelength increases.   If we also know how far that light traveled ...
	2021-03-09: How Does Gravity Affect Light? 03:00: The distance between the peaks of that wave is its wavelength. 03:18: Wavelength increases, which means frequency and energy drop. 04:10: These are the ticks of a clock, and the frequency dictates the frequency and the wavelength of the photon produced by that motion. 04:27: ... light emerging from it can be sapped of ALL energy - redshifted so the wavelength is effectively ... 03:18: Wavelength increases, which means frequency and energy drop.
	2021-02-17: Gravitational Wave Background Discovered? 00:00: ... waves from tens of kilometers to hundreds of thousands of kilometers in wavelength ligo can't see ripples with either smaller or larger wavelengths ligo is ...
	2020-10-05: Venus May Have Life! 02:22: ... of Venus appear to absorb the Sun’s light in a weird way - more short wavelength visible and UV light is sucked up than expected, leading to the yellow ... 03:58: This can be done at far infrared and submillimeter radio wavelengths where the star’s own glare doesn’t kill the signal. 04:07: One possible biosignature in this range is phosphine, which absorbs photons of around 1.1mm wavelength. 02:22: ... of Venus appear to absorb the Sun’s light in a weird way - more short wavelength visible and UV light is sucked up than expected, leading to the yellow colour of ... 03:58: This can be done at far infrared and submillimeter radio wavelengths where the star’s own glare doesn’t kill the signal.
	2020-09-08: The Truth About Beauty in Physics 13:50: Basically, why do we see specific wavelengths missing from starlight due to electrons absorbing those wavelengths in atoms? 13:58: Shouldn't those same electrons then drop back down in energy level, emitting the same wavelengths they absorbed? 14:04: ... absolutely do - and in some cases you see extra light at those special wavelengths - what we call emission lines, in some cases less light - absorption ... 14:22: ... in question are between us and a source of light that's bright at all wavelengths, then we see absorption - that's because although those atoms to reemit ... 13:50: Basically, why do we see specific wavelengths missing from starlight due to electrons absorbing those wavelengths in atoms? 13:58: Shouldn't those same electrons then drop back down in energy level, emitting the same wavelengths they absorbed? 14:04: ... absolutely do - and in some cases you see extra light at those special wavelengths - what we call emission lines, in some cases less light - absorption ... 14:22: ... in question are between us and a source of light that's bright at all wavelengths, then we see absorption - that's because although those atoms to reemit ... 14:04: ... absolutely do - and in some cases you see extra light at those special wavelengths - what we call emission lines, in some cases less light - absorption ... 13:50: Basically, why do we see specific wavelengths missing from starlight due to electrons absorbing those wavelengths in atoms?
	2020-08-17: How Stars Destroy Each Other 02:45: But it can be found if you look a little off center for a spot of light that flares erratically from visible to X-ray wavelengths. 06:16: ... pulses - most brightly in radio light, but potentially at all wavelengths. ... 07:38: He observed these objects using visible wavelength of light - and found one object was indeed pulsing. 02:45: But it can be found if you look a little off center for a spot of light that flares erratically from visible to X-ray wavelengths. 06:16: ... pulses - most brightly in radio light, but potentially at all wavelengths. ...
	2020-07-28: What is a Theory of Everything: Livestream 00:00: ... and it had over a hundred thousand numbers in it they were measured wavelengths of light coming out of all sorts of different atoms all right and it ...
	2020-06-22: Building Black Holes in a Lab 05:25: ... hole scattering the vibrational modes of the quantum fields that have wavelengths similar to the black hole’s event ...
	2020-05-11: How Luminiferous Aether Led to Relativity 09:02: ... in different places. Changes in length quite a bit smaller than a single wavelength of light would produce observable shifts in the fringe pattern. And this ...
	2020-05-04: How We Know The Universe is Ancient 01:35: ... incredible speeds, based on their Doppler shift - the lengthening of the wavelengths of their light due to their motion. Then Edwin Hubble figured out the ...
	2020-04-28: Space Time Livestream: Ask Matt Anything 00:00: ... light out rather than let it in middle it's only to only a tiny tiny wavelength band from an emission line hydrogen-alpha I think it is in the upper ...
	2020-01-13: How To Capture Black Holes 10:40: ... of the active galaxies — a fading flash that is brightest at ultraviolet wavelengths. ...
	2019-11-04: Why We Might Be Alone in the Universe 13:37: ... to test Loop Quantum Gravity So LQG predicts that light of different wavelengths travels at very slightly different ... 14:00: ... if space is quantized on tiny scales, then we expect the very shortest wavelengths of light to be slightly perturbed by these quantum cells of space - sort ... 14:15: Wavelengths longer than this quantum scale can ignore this fragmentation and so travel at normal speed. 13:37: ... to test Loop Quantum Gravity So LQG predicts that light of different wavelengths travels at very slightly different ... 14:00: ... if space is quantized on tiny scales, then we expect the very shortest wavelengths of light to be slightly perturbed by these quantum cells of space - sort ... 14:15: Wavelengths longer than this quantum scale can ignore this fragmentation and so travel at normal speed. 13:37: ... to test Loop Quantum Gravity So LQG predicts that light of different wavelengths travels at very slightly different ...
	2019-06-20: The Quasar from The Beginning of Time 03:22: Light is a wave and the wavelength of that wave determines the properties of light. 03:27: For example, visible light – the wavelength range that our eyes are sensitive to – spans only a tiny fraction of the spectrum. 03:34: That's why we create telescopes – the universe looks very, very different at different wavelengths. 04:53: ... spectrograph takes incoming light and breaks it into its component wavelengths, similar to a prism, and it records how much energy is received at each ... 05:12: ... traveling through the expanding universe sapped energy and stretched the wavelength of that light so that it was infrared by the time it reached the earth ... 06:24: ... same signature wavelengths used to measure redshift are also broadened due to the extreme speeds of ... 03:27: For example, visible light – the wavelength range that our eyes are sensitive to – spans only a tiny fraction of the spectrum. 03:34: That's why we create telescopes – the universe looks very, very different at different wavelengths. 04:53: ... spectrograph takes incoming light and breaks it into its component wavelengths, similar to a prism, and it records how much energy is received at each ... 06:24: ... same signature wavelengths used to measure redshift are also broadened due to the extreme speeds of ...
	2019-06-06: The Alchemy of Neutron Star Collisions 13:02: ... cosmic background radiation wasn't yet stretched to invisible microwave wavelengths?" - actually most of the dark ages would have actually been dark at least ...
	2019-05-16: The Cosmic Dark Ages 05:45: ... its spin direction it either absorbs or emits a radio photon with a wavelength of 21cm. When the first stars ignited they heated the surrounding gas, ... 08:11: ... the second photon of interest. It’s the Lyman-alpha photon – one with a wavelength of exactly 121.57 nanometers. That’s a hard ultraviolet photon that can ... 08:36: ... has expanded slightly. Photons that were once at the Lyman-alpha wavelength have been redshifted to longer wavelength and are no longer threatened ... 09:21: ... light continues on its way towards us, but the universe keeps expanding. Wavelength by wavelength, photons get absorbed as they are shifted into the danger ... 10:10: ... or being blasted back out again. This is the redshifted Lyman-alpha wavelength – once hard-ultraviolet, but now infrared. Everything to the left of ... 08:36: ... no longer threatened with absorption. Meanwhile, more energetic, shorter wavelength photons get shifted into the danger zone – they get completely absorbed as the ... 09:21: ... on its way towards us, but the universe keeps expanding. Wavelength by wavelength, photons get absorbed as they are shifted into the danger zone of Lyman-alpha ...
	2019-05-01: The Real Science of the EHT Black Hole 02:36: ... different points on the sky, and that difference should be of order one wavelength for maximum ... 02:51: ... separated by an angle that is the same as the ratio between the observed wavelength and the separation of the telescopes – also called the ... 03:03: The longer the baseline and the shorter the wavelength, the better the resolution. 03:08: ... ratio between wavelength and baseline is the same as the ratio between the size of the object ... 03:19: ... resolution of any telescope – it’s the diffraction limit – the observed wavelength divided by the diameter of the ... 03:50: ... you build an interferometer that spans the planet Earth the wavelength you need in order to get this resolution is around 1mm, which is around ... 07:43: Remember that the EHT observes radio light with a wavelength of around a millimeter. 07:52: That wavelength should be dominated by synchrotron radiation, not from the thermal radiation of the accretion disk. 03:19: ... resolution of any telescope – it’s the diffraction limit – the observed wavelength divided by the diameter of the ... 03:50: ... order to get this resolution is around 1mm, which is around the shortest wavelength radio ...
	2019-02-20: Secrets of the Cosmic Microwave Background 02:05: ... mathematics of spherical harmonics Sort of like sine waves but different wavelengths but on a 2D surface of a sphere Fluctuations in each of these layers ...
	2019-02-07: Sound Waves from the Beginning of Time 02:09: Unbound electrons present a huge target to scatter any wavelength of light.
	2019-01-24: The Crisis in Cosmology 03:05: This is the lengthening of the wavelength of light from that galaxy,...
	2018-10-25: Will We Ever Find Alien Life? 04:26: ... observations revealed that the wavelength dependence of the dips is consistent with dust, so likely natural space ...
	2018-10-18: What are the Strings in String Theory? 05:57: Constructive interference only happens if the wavelength of the wave fits a neat number of times along the length of the string. 06:22: These resonant frequencies depend on the length of the string, also its tension, which defines wave velocity and so relates frequency to wavelength. 06:04: Then the phases of the overlapping wave match in the right way, and that wavelength/frequency of the wave is enhanced.
	2018-05-16: Noether's Theorem and The Symmetries of Reality 01:22: Its wavelength increases.
	2018-05-09: How Gaia Changed Astronomy Forever 04:49: ... shows the tiny Doppler shift-- the stretching or compression of the wavelength of starlight due to the motion towards or away from ...
	2018-05-02: The Star at the End of Time 05:23: The black-body spectrum of a hot object emits relatively more photons at short energetic wavelengths than a cooler object. 05:31: For most of its life, the spectrum of a red dwarf peaks at infrared wavelengths. 05:23: The black-body spectrum of a hot object emits relatively more photons at short energetic wavelengths than a cooler object. 05:31: For most of its life, the spectrum of a red dwarf peaks at infrared wavelengths.
	2018-04-18: Using Stars to See Gravitational Waves 02:19: ... gravitational fields which can amplify the signal and stretch out the wavelengths. ... 05:23: But much of this gravitational wave background will have wavelengths as long as many light years. 02:19: ... gravitational fields which can amplify the signal and stretch out the wavelengths. ... 05:23: But much of this gravitational wave background will have wavelengths as long as many light years.
	2018-04-11: The Physics of Life (ft. It's Okay to be Smart & PBS Eons!) 12:59: ... horizon should produce a type of Hawking radiation, but its wavelength would be comparable to the distance to that horizon, so it's completely ...
	2018-03-21: Scientists Have Detected the First Stars 01:42: That photon has a wavelength of 21 centimeters, which is radio light. 03:08: Absorption at 21 centimeters would now look like absorption at a much longer wavelength. 03:14: In fact, there should be this broad dip at a range of wavelengths, representing the epoch of the universe in which this absorption was occurring. 03:55: The wavelength range of the dip corresponds to the epoch between 180 to 270 million years after the Big Bang. 03:14: In fact, there should be this broad dip at a range of wavelengths, representing the epoch of the universe in which this absorption was occurring.
	2018-03-15: Hawking Radiation 07:18: Black holes tend to scatter modes with wavelengths similar to their own sizes. 07:23: The quantum field that emerges is distorted in the same wavelength range. 07:29: It produces particles that also have wavelengths about as large as the event horizon. 07:34: So the more massive the black hole, the longer the wavelength of its radiation. 08:51: Remember that Hawking radiation has wavelengths the size of the event horizon, the size of the entire black hole. 08:57: Well, these are the de Broglie wavelengths of created particles. 07:23: The quantum field that emerges is distorted in the same wavelength range. 07:18: Black holes tend to scatter modes with wavelengths similar to their own sizes. 07:29: It produces particles that also have wavelengths about as large as the event horizon. 08:51: Remember that Hawking radiation has wavelengths the size of the event horizon, the size of the entire black hole. 08:57: Well, these are the de Broglie wavelengths of created particles.
	2017-11-29: Citizen Science + Zero-Point Challenge Answer 08:22: That corresponds to a photon wavelength of a tenth of a millimeter, which is in the far infrared part of the spectrum. 08:42: ... with wavelengths shorter than 0.1 millimeters definitely exist, and we see particle ... 09:06: That proves the existence of virtual photons with wavelengths smaller than the plate separation. 08:42: ... we see particle interactions that require the exchange of much shorter wavelength virtual ... 09:06: That proves the existence of virtual photons with wavelengths smaller than the plate separation. 08:42: ... with wavelengths shorter than 0.1 millimeters definitely exist, and we see particle interactions ... 09:06: That proves the existence of virtual photons with wavelengths smaller than the plate separation.
	2017-10-25: The Missing Mass Mystery 06:33: This cool gas then absorbs signature wavelengths from light that passes through it.
	2017-10-04: When Quasars Collide STJC 06:30: Now, this is a process called synchrotron self-absorbtion, and it causes the base of AGN jets to be much fainter at long wavelengths. 09:48: And this galaxy is so dusty that it's hard to peer into the core at other wavelengths of light. 06:30: Now, this is a process called synchrotron self-absorbtion, and it causes the base of AGN jets to be much fainter at long wavelengths. 09:48: And this galaxy is so dusty that it's hard to peer into the core at other wavelengths of light.
	2017-09-28: Are the Fundamental Constants Changing? 04:48: We see this effect in the sharp spikes or dips in light at specific wavelengths when we observe the spectrum of a gas. 06:09: The result is a very small difference in the wavelengths of the spectral lines produced by those transitions. 06:20: Well, the magnitude of this wavelength split depends very strongly on the fine structure constant. 08:26: ... distant quasars and gas clouds are massively redshifted-- their wavelengths stretched out due to the expansion of the ... 13:58: But that's because the distance between atoms is similar to x-ray wavelengths. 06:20: Well, the magnitude of this wavelength split depends very strongly on the fine structure constant. 04:48: We see this effect in the sharp spikes or dips in light at specific wavelengths when we observe the spectrum of a gas. 06:09: The result is a very small difference in the wavelengths of the spectral lines produced by those transitions. 08:26: ... distant quasars and gas clouds are massively redshifted-- their wavelengths stretched out due to the expansion of the ... 13:58: But that's because the distance between atoms is similar to x-ray wavelengths. 08:26: ... distant quasars and gas clouds are massively redshifted-- their wavelengths stretched out due to the expansion of the ...
	2017-09-20: The Future of Space Telescopes 03:27: The number and length of pedals optimizes each starshade for a particular wavelength of light. 08:00: X-rays have such short wavelengths that telescope mirrors have to be astoundingly smooth to reflect them cleanly.
	2017-08-24: First Detection of Life 01:47: ... dips that result from molecules in Earth's atmosphere absorbing specific wavelengths of light from what would otherwise be the smooth heat glow of the ... 02:24: Going to longer wavelengths we see carbon dioxide, nitrous oxide, methane, ozone, and, well, more water. 01:47: ... dips that result from molecules in Earth's atmosphere absorbing specific wavelengths of light from what would otherwise be the smooth heat glow of the ... 02:24: Going to longer wavelengths we see carbon dioxide, nitrous oxide, methane, ozone, and, well, more water.
	2017-08-02: Dark Flow 01:49: In all directions, it appears to be the same temperature-- around 2.7 Kelvin-- and hence, the same microwave wavelength. 02:13: That motion causes the CMB to be Doppler shifted, its wavelengths a little stretched out behind and a little more compacted ahead.
	2017-07-19: The Real Star Wars 04:56: Then, by passing electromagnetic radiation at a wavelength tuned to an energy level transition in that substance, stimulated emission can occur.
	2017-06-07: Supervoids vs Colliding Universes! 01:59: ... billion years of cosmic expansion later, and it stretched to microwave wavelengths, and to a temperature very close to 2.725 Kelvin all across the ... 05:46: ... layman's terms, they split the light from those galaxies into component wavelengths and determined the shift in the wavelengths of those spectra due to the ... 12:48: ... into a spectrum and look for emission lines, light at the signature wavelengths of heavier ... 01:59: ... billion years of cosmic expansion later, and it stretched to microwave wavelengths, and to a temperature very close to 2.725 Kelvin all across the ... 05:46: ... layman's terms, they split the light from those galaxies into component wavelengths and determined the shift in the wavelengths of those spectra due to the ... 12:48: ... into a spectrum and look for emission lines, light at the signature wavelengths of heavier ...
	2017-05-31: The Fate of the First Stars 06:29: Those electrons then lose that energy by emitting light at specific wavelengths-- signature photons that are different for every element or molecule. 10:21: They radiate intense light, with a signature ultraviolet wavelength of hydrogen. 06:29: Those electrons then lose that energy by emitting light at specific wavelengths-- signature photons that are different for every element or molecule.
	2017-04-05: Telescopes on the Moon 01:51: ... but its biggest advantage is that it can see into near ultraviolet wavelengths and in the visible range observable within our ...
	2017-03-01: The Treasures of Trappist-1 04:12: Wein's law tells us that the 2,500 Kelvin TRAPPIST-1 star shines brightest at infrared wavelengths.
	2017-02-15: Telescopes of Tomorrow 01:34: These cameras see mostly at infrared wavelengths of light, unlike Hubble's, which are optimized for visible and ultraviolet light. 01:57: Longer wavelengths of light scatter less easily than shorter wavelengths, and so have an easier time escaping these dust-packed stellar nurseries. 02:06: Compare two shots from Hubble-- this taken in visible wavelengths, this in infrared. 02:11: Webb will see even longer wavelength infrared light and so will bore even deeper. 03:29: The finest detail any telescope can observe is given by the diffraction limit, which increases with wavelength. 03:59: The biggest challenge in observing infrared wavelengths is heat. 04:31: But without sensitivity to visible or ultraviolet wavelengths, it will not replace Hubble. 05:18: Observing in infrared wavelengths is hard. 05:21: But GMT is built to explore visible wavelengths, just like Hubble. 02:11: Webb will see even longer wavelength infrared light and so will bore even deeper. 01:34: These cameras see mostly at infrared wavelengths of light, unlike Hubble's, which are optimized for visible and ultraviolet light. 01:57: Longer wavelengths of light scatter less easily than shorter wavelengths, and so have an easier time escaping these dust-packed stellar nurseries. 02:06: Compare two shots from Hubble-- this taken in visible wavelengths, this in infrared. 03:59: The biggest challenge in observing infrared wavelengths is heat. 04:31: But without sensitivity to visible or ultraviolet wavelengths, it will not replace Hubble. 05:18: Observing in infrared wavelengths is hard. 05:21: But GMT is built to explore visible wavelengths, just like Hubble.
	2017-01-25: Why Quasars are so Awesome 03:05: For one thing, its spectrum was redshifted, the wavelength of its light stretched out as those photons traveled through the expanding universe.
	2017-01-04: How to See Black Holes + Kugelblitz Challenge Answer 03:06: They use very long baseline interferometry, VLBI, to synthesize observations at millimeter and submillimeter wavelengths. 04:09: At visible wavelengths, this should look like a brightening of the star, an effect called microlensing. 03:06: They use very long baseline interferometry, VLBI, to synthesize observations at millimeter and submillimeter wavelengths. 04:09: At visible wavelengths, this should look like a brightening of the star, an effect called microlensing.
	2016-12-21: Have They Seen Us? 07:40: That emission, produced at 21 centimeters wavelength, or 1420 megahertz frequency, is, by definition, one of the boundaries of the waterhole.
	2016-11-09: Did Dark Energy Just Disappear? 14:40: ... interference bands when the distance between the slits is similar to the wavelength of the light, and with slit widths significantly narrower than that ...
	2016-08-24: Should We Build a Dyson Sphere? 00:53: ... only as strange points of infrared lights but otherwise black at visible wavelengths. ...
	2016-08-03: Can We Survive the Destruction of the Earth? ft. Neal Stephenson 12:30: You can define a theoretical wavelength of a macroscopic object's wave function-- it's the de Broglie wavelength, and it's very, very small. 12:39: ... do so you'd need slits whose separation is similar to their de Broglie wavelength. ...
	2016-06-22: Planck's Constant and The Origin of Quantum Mechanics 01:31: We talked about this recently when we discussed the de Broglie wavelength. 02:12: ... Heisenberg uncertainty principle and the de Broglie wavelength, but also the Schrodinger equation, the energy levels of electron orbits, ...
	2016-06-15: The Strange Universe of Gravitational Lensing 10:54: ... Mayo asks whether my interpretation of the de Broglie wavelength as a range of possible locations is only true for the Copenhagen ...
	2016-06-01: Is Quantum Tunneling Faster than Light? 01:43: And that wave packet has a wavelength. 01:46: This de Broglie Wavelength defines how well determined an object's position is. 01:52: A large wavelength means a highly uncertain position. 01:57: A small wavelength means a well-defined position. 02:23: See an object's de Broglie wavelength depends on its momentum, so mass times velocity. 02:31: Higher momentum means a smaller wavelength. 02:37: ... tens of kilograms of thermal moving particles and have de Broglie wavelengths a couple of orders of magnitude smaller than the Planck ... 08:20: A particle resolves its location anywhere within the vicinity of its de Broglie wavelength. 08:59: This can look like an increase in the speed of light, but only within the uncertainty range defined by the de Broglie wavelength. 09:07: ... which is perhaps the deeper principle from which the de Broglie wavelength ... 01:46: This de Broglie Wavelength defines how well determined an object's position is. 02:23: See an object's de Broglie wavelength depends on its momentum, so mass times velocity. 02:37: ... tens of kilograms of thermal moving particles and have de Broglie wavelengths a couple of orders of magnitude smaller than the Planck ...
	2016-04-27: What Does Dark Energy Really Do? 01:33: During that expansion, it increases the wavelength of these electromagnetic waves, resulting in what we see as redshift, cosmological redshift.
	2016-02-24: Why the Big Bang Definitely Happened 01:42: Light from distant galaxies is red shifted, stretched to longer wavelengths.
	2016-02-17: Planet X Discovered?? + Challenge Winners! 03:37: The relativistic Doppler effect classically changes the wavelengths of light, blue-shifting approaching material and red-shifting receding material.
	2015-12-16: The Higgs Mechanism Explained 07:55: ... falls to the horizon, the light it emits is red shifted such long wavelengths that it effectively becomes ...
	2015-09-23: Does Dark Matter BREAK Physics? 09:36: In fact, in the vicinity of the black hole, this radiation is poorly localized, having a wavelength of all of the Schwarzschild radius.
	2015-05-27: Habitable Exoplanets Debunked! 03:54: ... from that of its star and see how bright that light is at different wavelengths. ... 04:01: That graph of brightness versus wavelength is called an object's spectrum. 04:05: Since different atoms and molecules emit or absorb particular wavelengths of light only, the spectrum tells you a lot about atmospheric composition. 03:54: ... from that of its star and see how bright that light is at different wavelengths. ... 04:05: Since different atoms and molecules emit or absorb particular wavelengths of light only, the spectrum tells you a lot about atmospheric composition.
	2015-03-25: Cosmic Microwave Background Explained 01:46: It's emitting electromagnetic waves of all wavelengths. 01:49: Moreover, the intensity at different wavelength is in very specific proportions that trace out a graph very close to this. 02:04: Now, everything has a temperature, so everything has a thermal spectrum, and it emits all electromagnetic wavelengths. 02:21: ... to 2.7 degrees above absolute zero, the peak shifts way into microwave wavelengths and, lo and behold, exactly matches the CNB, and I mean ... 04:28: ... a prior episode that you can revisit here, expanding space stretches the wavelength of free streaming light through a process called cosmological ... 04:37: ... orangey thermal spectrum of light was redshifted to longer and longer wavelengths, becoming toaster read and eventually infra-red, so that to human eyes, ... 01:46: It's emitting electromagnetic waves of all wavelengths. 02:04: Now, everything has a temperature, so everything has a thermal spectrum, and it emits all electromagnetic wavelengths. 02:21: ... to 2.7 degrees above absolute zero, the peak shifts way into microwave wavelengths and, lo and behold, exactly matches the CNB, and I mean ... 04:37: ... orangey thermal spectrum of light was redshifted to longer and longer wavelengths, becoming toaster read and eventually infra-red, so that to human eyes, ...
	2015-02-25: How Do You Measure the Size of the Universe? 03:02: Light has a color determined by its wavelength. 03:04: Longer wavelength light is redder, shorter bluer. 03:14: But because space is expanding, the wavelength of light gets stretched as it travels to us, making the blue light red; hence, the term redshift. 03:22: In more extreme cases, the wavelength can be stretched out of the visible spectrum altogether, into microwaves or radio waves. 03:42: And thus, it has its wavelength stretched more. 03:04: Longer wavelength light is redder, shorter bluer. 03:42: And thus, it has its wavelength stretched more.

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