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...s]] or MHD. MHD is similar in operation to electric motors, however rather than using moving parts or metal conductors, fluid or plasma conductors are empl ...|first2=Dana G. |date=March 1991 |title=Magnetic sails and interplanetary travel |url=https://arc.aiaa.org/doi/10.2514/3.26230 |journal=Journal of Spacecraf ...

...f [[relativity theory]] stating that information cannot travel faster than light is exploited too. Technically speaking, relativistic quantum cryptography i ...alling principle that information cannot travel faster than the [[speed of light]]. This is called the no-superluminal signalling principle. ...

...rials. The technique uses [[Inelastic scattering|inelastic]] scattering of light when it encounters acoustic phonons in a crystal, a process known as [[Bril ...²⁻, can be obtained through a Raman spectroscopy study shedding light on structure and chemical composition,<ref>Buzgar N., Apopei A., (2009) The ...

...f the [[mass]] of [[neutrino]]s. Astronomical searches investigate whether light and neutrinos emitted simultaneously from a distant source are arriving sim ...ativity]]. Existing measurements provided upper limits for deviations from light speed of approximately 10⁻⁹, or a [[Parts-per notation|few parts ...

...rst time in the [[Chronology of the universe|history of the universe]], to travel long distances. They can still be detected today, although they now appear ...ectron [[Thomson scattering]] area, and <math> c </math> is the [[speed of light]]. ...

...imilar to the cause of a [[sonic boom]], the sharp sound heard when faster-than-sound movement occurs. The phenomenon is named after Soviet physicist [[Pav ...ions that were excited by [[gamma ray]]s instead of less energetic visible light, as done commonly. He discovered the [[anisotropy]] of the radiation and ca ...

...ating the assumption that signals cannot travel faster than the [[speed of light]]. ...

{{short description|1676 demonstration of light's finite speed by Danish astronomer Ole Rømer}} ...t official in his native [[Denmark]] after his discovery of the [[speed of light]] (1676). The engraving is probably posthumous.]] ...

...of about 10 kilometres. Hence, under these circumstances, the velocity of light at an elevation of 10 kilometres would be to its velocity at the surface in ...noticeable than sinking because objects that appear to grow stand out more than those that appear to shrink. ...

...k matter. This concept explains why galaxies and clusters exhibit stronger-than-expected gravitational effects—gravity is enhanced not by extra invisible m ...cts. General Relativity predicts that GWs travel unimpeded at the speed of light, MDT suggests that: ...

...uces their transparency to the laser light, as those atoms begin to absorb light from the laser producing a drop of intensity of the laser after it passes t ...ly on transfers of [[Polarization (waves)|polarization]] between the laser light and the atoms in the cell, the fewer ways transfers of this kind can occur ...

...rinciple stating that information cannot travel faster than the [[speed of light]] ([[no-communication theorem|no-signalling]]). In 1999 he published the fi | title = Coin Tossing is Strictly Weaker than Bit Commitment ...

...even when the [[Theory of relativity|relativity]] limits of the [[speed of light]] are ignored. The existence of such a finite speed was discovered mathemat ...ion, or anything else for that matter, can travel faster than the speed of light. When non-relativistic mechanics is considered, however, ([[Newtonian mecha ...

...fitted to all aircraft and the bombs dropped by the light operator rather than the pilot.{{sfn|Nesbit|2008|p=193}} ...tends to be slower at low altitudes, and attack aircraft generally travel faster, the relative effect of the wind is significantly less. Moreover, the pilot ...

...w it is that we can experimentally determine the true motions of bodies in light of the fact that absolute space is not something that can be perceived. Su ...he origin of our coordinate system. Look first at one of the two balls. To travel in a circular path, which is ''not'' uniform motion with constant velocity, ...

where ''c'' is the [[speed of light]] in vacuum. The [[differential of a function|differential]]s in ''t'' and ...w "timelike geodesics", and hypothetical particles that travel faster than light known as [[tachyons]] follow "spacelike geodesics". ...

...ich are more [[responsivity|responsive]] to electrical and optical stimuli than metals. This gives rise to the possibility of efficiently tuning the [[magn ...displays, which can be flexible, thinner, faster and more power efficient than [[LCD]] screens, and [[organic field-effect transistors]], intended for lar ...

Aerodynamics work throughout the 19th century sought to achieve [[heavier-than-air]] flight. [[George Cayley]] developed the concept of the modern fixed- ...| author=von Karman, Theodore | title=Aerodynamics: Selected Topics in the Light of Their Historical Development | publisher=Dover Publications | year=2004 ...

...he medium - which can result in more photons arriving at the end of a path than entering it. &nbsp;It also deals with radiation arriving at a detector from ...henomena makes the [[absorptance|absorptivity]] of incoming radiation less than 1 and equal to emissivity ([[Kirchhoff's law of thermal radiation|Kirchhoff ...

...the [[polarizer]]s while the [[photon]]s were in flight, faster than what light would take to reach the other polarizer, removing the possibility of commun ...other, since this would involve information being transmitted faster than light, which is forbidden by the [[theory of relativity]]. They invoked a princip ...