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Why No One Has Measured The Speed Of Light

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That's a misconception. Light travels at the same speed regardless of its frequency. It doesn't change with intensity, either.



Yup, Cherenkov radiation is effectively a sonic boom. How cool is that?! Read all about it, here:



It's about 1.3 seconds to get to the moon, quite a bit faster.
I knew it wasn't instantaneous and heard that 4 seconds was the delay value at one time.
1.3 however does sound more reasonable.
 
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the speed of light is so 1930s ,its the speed of Dark im interested in :) .
 
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It has been proven as fact in the case of black holes, lines of magnetic force do emanate from a black hole and that means it's coming up from the hole through it's event horizon.
So if you must go faster than light itself to make it up and out of the event horizon, well - There you go.
I highly doubt this is "fact" but as a non scientist I cannot explain why.
 
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It has been proven as fact in the case of black holes, lines of magnetic force do emanate from a black hole and that means it's coming up from the hole through it's event horizon.
Was it shown specifically to emanate FROM it? Because I see plenty of proof for magnetic fields in the immediate vicinty of a black hole, but not necessarily emanating from it.

Hawking radiation is emanating from black holes specifically and it is due to quantum effects which are still yet to be combined with relativity in all-encompassing way.
 

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Nobody has measured yet because Mother Russia hasn't found way to send dog faster than speed of light yet.
 
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Schrodinger, he used cat... but the collapse of the quantum wave function, it beats the speed of light.

Hawking radiation is emanating from black holes specifically and it is due to quantum effects which are still yet to be combined with relativity in all-encompassing way.
Dyson suspected that there may be no need to combine, that gravity can stay classical.

It has been proven as fact in the case of black holes, lines of magnetic force do emanate from a black hole and that means it's coming up from the hole through it's event horizon.
So if you must go faster than light itself to make it up and out of the event horizon, well - There you go.
The magnetic field is one thing, electromagnetic radiation another. The second emanates, the first is just frozen in.
 
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I highly doubt this is "fact" but as a non scientist I cannot explain why.
Had to re-research it from what I recalled earlier to make sure. I know once I saw an article/vid about magnetic fields and black holes that was beyond just interesting.
I believe this is it along with a few others for additional reading about this and related things.

Massive Black Hole Photographed Reportedly 'Burping' Light

Magnetic Field around a Black Hole Mapped for the First Time - Scientific American

Magnetic Fields May Be Key to Black Hole Activity | NASA

This seemed interesting enough to include:

Galaxy Survives Black Hole’s Feast – For Now | NASA

What will we find in the next 10 years that's gonna make us lose our minds over what we think we "know" today?
Time will tell and should be.... Interesting.
 
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This issue is the nature of timespace both at a quantum level and at galactic size. Since all timespace is curved the direction light travels is unimportant, as emr travelling on the x axis is also travelling to some degree through the Y & Z axis. It very likely that if light had a different speed for the opposite of a particular direction there would be measurable outcomes. The comparison with antimatter v matter is unfortunate and misplaced. The video is like candy for the high IQ audience. I am concerned some might take it seriously and it could a physics earworm.
 
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Dyson suspected that there may be no need to combine, that gravity can stay classical.
Given the continued efforts to unify the two, it doesn't seem likely to be the case.
 
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One could argue the other way around; so much effort for so long and still no success.
 
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That's most definitely not a winning attitude, not just in science, but in many other aspects of life.
 
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Nature decides if gravity is classical or quantum.

This is Science, not Engineering.
 
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FFB71C81-141F-4B35-8DE1-3DA464913504.jpeg


:cool:
 

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I wasn’t trying :D

You guys are pulsing brains, I am no match. I quit reading that stuff years ago.
 

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Dorset where else eh? >>> Thats ENGLAND<<<
Try harder.

:p (added to make it clear we're playing here)
I can play to
Just asking when in Time that is
Precession – As Earth rotates, it wobbles slightly upon its axis, like a slightly off-center spinning toy top. This wobble is due to tidal forces caused by the gravitational influences of the Sun and Moon that cause Earth to bulge at the equator, affecting its rotation.
 
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Nature decides if gravity is classical or quantum.

This is Science, not Engineering.

Classical it certainly isn't, though on certain scales it is good enough approximation. If anything, perhaps you meant described by GR.

Or maybe has duality, much like light.

Or maybe it is neither. And we have to start building theories from scratch...
 
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I can play to
Just asking when in Time that is
Precession – As Earth rotates, it wobbles slightly upon its axis, like a slightly off-center spinning toy top. This wobble is due to tidal forces caused by the gravitational influences of the Sun and Moon that cause Earth to bulge at the equator, affecting its rotation.
In modern parlance: Incorrect. BITD: Nice try but no cigar.

An equatorial bulge is a difference between the equatorial and polar diameters of a planet, due to the centrifugal force exerted by the rotation about the body's axis. A rotating body tends to form an oblate spheroid rather than a sphere.
Source: https://en.wikipedia.org/wiki/Equatorial_bulge

All parts of the Earth rotate at the same angular speed. As the latitude decreases, moving towards the equator, the radius of revolution (at the Earth's surface) increases. Therefore the parts closer to the equator need larger centripetal forces to keep them revolving. To get those larger forces, the material of the Earth must "stretch out" more, similar to a spring whose tension force increases as you stretch it.

Source https://www.physicsforums.com/threa...y-does-the-earth-bulge-at-the-equator.745030/

The Fizeau–Foucault apparatus is either of two types of instrument historically used to measure the speed of light. The conflation of the two instrument types arises in part because Hippolyte Fizeau and Léon Foucault had originally been friends and collaborators.
https://en.wikipedia.org/wiki/Fizeau–Foucault_apparatus

Albert Abraham Michelson FFRS HFRSE (December 19, 1852 – May 9, 1931) was an American physicist known for his work on measuring the speed of light and especially for the Michelson–Morley experiment. In 1907 he received the Nobel Prize in Physics, becoming the first American to win the Nobel Prize in a science.

The period after 1927 marked the advent of new measurements of the speed of light using novel electro-optic devices, all substantially lower than Michelson's 1926 value.
Michelson sought another measurement, but this time in an evacuated tube to avoid difficulties in interpreting the image owing to atmospheric effects. In 1929, he began a collaboration with Francis G. Pease and Fred Pearson to perform a measurement in a 1.6 km tube 3 feet in diameter at the Irvine Ranch near Santa Ana, California.[35][36] In multiple reflections the light path was increased to 5 miles. For the first time in history the speed of light was measured in an almost perfect vacuum of 0.5 mm of mercury. Michelson died with only 36 of the 233 measurement series completed and the experiment was subsequently beset by geological instability and condensation problems before the result of 299,774 ± 11 km/s, consistent with the prevailing electro-optic values, was published posthumously in 1935.[36]
During June and early July 1879, Michelson refined experimental arrangements from those developed by Hippolyte Fizeau and Léon Foucault. The experimental setup was as follows: Light generated from a source is directed towards a rotating mirror through a slit on a fixed plate; the rotating mirror reflects the incoming light and at a certain angle, towards the direction where another fixed flat mirror is placed whose surface is perpendicular to the incoming ray of light; the rotating mirror should have rotated by an angle α by the time the ray of light travels back and is reflected again towards the fixed plate (the distance between the fixed mirror and the rotating one is recorded as D); a displacement from the slit is detected on the plate which measures d; the distance from the rotating mirror to the fixed plate is designated as the radius r while the number of revolutions per second of the mirror is recorded as ω. In this way, tan(2α) = d/r; Δt = (α/2π)/ω; speed of light can be derived as c = 2D/Δt.
Some of our forum members should undertake some simple Google searches before posting blether.
 
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In an Ideal Universe the speed of light is a constant but because we don't exist in an ideal universe there is some discrepancies where spacetime is warped beyond normal
 
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In an Ideal Universe the speed of light is a constant but because we don't exist in an ideal universe there is some discrepancies where spacetime is warped beyond normal
Are you trolling me for a comment? The speed of light remains constant regardless of the curvature of spacetime. However, the redshift of light will be impacted.

The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299792458 metres per second (approximately 300000 km/s, or 186000 mi/s).[Note 3] It is exact because, by international agreement, a metre is defined as the length of the path travelled by light in vacuum during a time interval of 1⁄299792458 second.[Note 4][3] According to special relativity, c is the upper limit for the speed at which conventional matter, energy or any signal carrying information can travel through space.
The speed at which light waves propagate in vacuum is independent both of the motion of the wave source and of the inertial frame of reference of the observer.[Note 5] This invariance of the speed of light was postulated by Einstein in 1905,[6] after being motivated by Maxwell's theory of electromagnetism and the lack of evidence for the luminiferous aether;[16] it has since been consistently confirmed by many experiments.[Note 6]
The special theory of relativity explores the consequences of this invariance of c with the assumption that the laws of physics are the same in all inertial frames of reference.[19][20] One consequence is that c is the speed at which all massless particles and waves, including light, must travel in vacuum.
Special relativity has many counterintuitive and experimentally verified implications.[21] These include the equivalence of mass and energy (E = mc2), length contraction (moving objects shorten),[Note 7] and time dilation (moving clocks run more slowly). The factor γ by which lengths contract and times dilate is known as the Lorentz factor and is given by γ = (1 − v2/c2)−1/2, where v is the speed of the object. The difference of γ from 1 is negligible for speeds much slower than c, such as most everyday speeds—in which case special relativity is closely approximated by Galilean relativity—but it increases at relativistic speeds and diverges to infinity as v approaches c. For example, a time dilation factor of γ = 2 occurs at a relative velocity of 86.6% of the speed of light (v = 0.866 c). Similarly, a time dilation factor of γ = 10 occurs at v = 99.5% c.
The results of special relativity can be summarized by treating space and time as a unified structure known as spacetime (with c relating the units of space and time), and requiring that physical theories satisfy a special symmetry called Lorentz invariance, whose mathematical formulation contains the parameter c.[24] Lorentz invariance is an almost universal assumption for modern physical theories, such as quantum electrodynamics, quantum chromodynamics, the Standard Model of particle physics, and general relativity. As such, the parameter c is ubiquitous in modern physics, appearing in many contexts that are unrelated to light. For example, general relativity predicts that c is also the speed of gravity and of gravitational waves.[25][Note 8] In non-inertial frames of reference (gravitationally curved spacetime or accelerated reference frames), the local speed of light is constant and equal to c, but the speed of light along a trajectory of finite length can differ from c, depending on how distances and times are defined.[27]
It is generally assumed that fundamental constants such as c have the same value throughout spacetime, meaning that they do not depend on location and do not vary with time. However, it has been suggested in various theories that the speed of light may have changed over time.[28][29] No conclusive evidence for such changes has been found, but they remain the subject of ongoing research.[30][31]
 
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Oooo theres a lot of Source here but some nice thinking as well, i like thinking out the box. i carnt remember who said this but "what we know about the universe is = to putting a small box over ones head and looking through a pin hole" i think it was Pat Moore but could be wrong.
 
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Oooo theres a lot of Source here but some nice thinking as well, i like thinking out the box. i carnt remember who said this but "what we know about the universe is = to putting a small box over ones head and looking through a pin hole" i think it was Pat Moore but could be wrong.
The Sky at Night appealed hugely to laymen as well as experts. This was largely because of Moore's ability to make inspired connections and analogies: linking the Milky Way to a fried egg, a solar eclipse to a Spanish taxi-driver and the moon to a dog walking uphill. Few people with degrees in science – he had no degrees in anything except many honorary doctorates – could have held the audience so imaginatively and with so little self-importance.

I am not sure that Sir Patrick Moore is an authoritative source. Yes, we all know people with university degrees but know nothing.

I'll give some more out of the box (mostly) unsourced comments:
  1. Due to the curvature of spacetime, we can't image (in any spectrum) the whole of the universe.
  2. The earth is at the centre of the universe because every point in the universe is at the centre of the universe. https://textureoftime.wordpress.com/2016/03/02/blushing-omnicentricity/
  3. The universe is infinitely old.
  4. The universe is a black hole. See: Schwarzschild solution
  5. The Big Bang event (if there was one) was when enough matter had entered the black hole reducing density sufficiently to allow spacetime to be created. Consider the density of TON 618?
  6. Redshifting of stars is not due to the doppler effect. https://en.wikipedia.org/wiki/Tired_light
  7. Euclidean space only holds over cosmically tiny distances.
  8. Spacetime is a manifold.
  9. Traveling in the x-axis over cosmic distances results in deviation on both the y and z-axis.
  10. Light is impacted by the above point causing redshifting.
  11. Matter traveling at c, cosmic rays do not lose energy as a result of timespace curvature. Conservation of momentum
  12. The correct model of the cosmos was explained by Albert Einstein in The Theory of Relativity.
  13. Protons do not decay.
  14. The current model gives an age for the universe insufficient to allow time for TON 618 and other hyper massive black holes to form.
  15. When a model needs constant changes to allow for new observations: it is wrong!
  16. Much of modern cosmology is poorly peer-reviewed (insufficiently multidisciplinary).
  17. If it is difficult to comprehend by really smart people then it is probably wrong: John Maynard Keynes & Occam's Razor.
  18. CBR is caused by the manifold nature of timespace.
  19. There are only rotating uncharged axially-symmetric black holes with a quasispherical event horizon: Kerr Metric.
  20. The matter that falls onto a black hole forms an external accretion disk heated by friction, forming quasars, some of the brightest objects in the universe. So black holes are anything but black.
  21. The first false-colour image in radio waves of the supermassive black hole at the core of supergiant elliptical galaxy Messier 87 (with a mass about 7 billion times that of the Sun) released by the Event Horizon Telescope on 10 April 2019 was NOT a photograph. It was an exercise in modeling a tiny number of pixels using super-resolution techniques.
None of the above thoughts are original.

The most famous equation in the world: E=mc2 was (with all due respect to Albert Einstein) was not original. Each part had already been discovered.

Tardian, Lord of Timespace

Fourth Doctor: “You know, the very powerful and the very stupid have one thing in common: they don’t alter their views to fit the facts; they alter the facts to fit their views.”
 

FireFox

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This thread seems more like a Flash season:ohwell:
Btw, very interesting topic.
As always sorry for the off-topic.
 
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I am not sure that Sir Patrick Moore is an authoritative source
i value everybody on this planet as my = and to think anything else would be a disservice to myself. Pat was one of the brightest sparks id ever met .
 

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I am not sure that Sir Patrick Moore is an authoritative source. Yes, we all know people with university degrees but know nothing.
There are several incorrect statements in your post, but I'll just concentrate on this one, or it will go one forever.

It's disingenious to dismiss Patrick Moore as not authoritative. One doesn't have to have degrees and doctorates in a particilar subject to know what they're talking about. Going by your logic, everything you've said or willever say will be invalid because you don't have a formal qualification in the subject. Can you now see where your assertion is wrong?

Also, everything that Patrick said on the Sky at Night was fact checked by researchers and astronomers / scientists, it wasn't just his uninformed opinion like you make out, so you can be sure that it was correct.


i value everybody on this planet as my = and to think anything else would be a disservice to myself. Pat was one of the brightest sparks id ever met .
Indeed he was. I remember wanting to meet him too, but there was no clear way to do so and then he rather selfishly died before I had the chance, tsk.

RIP Sir Patrick. :(
 
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