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  2. Special relativity - Wikipedia

    en.wikipedia.org/wiki/Special_relativity

    During their journey, people on Earth will experience more time than they do – since their clocks (all physical phenomena) would really be ticking 3.1 times faster than those of the spaceship. A 5-year round trip for the traveller will take 6.5 Earth years and cover a distance of over 6 light-years.

  3. Holmes rebound phenomenon - Wikipedia

    en.wikipedia.org/wiki/Holmes_Rebound_phenomenon

    The Holmes rebound phenomenon is a reflex that occurs when one attempts to move a limb against resistance that is suddenly removed. [1] When the resistance is removed, the limb will usually move a short distance in the original direction, at which point the antagonist muscles will contract, causing the muscle to yank back in the opposite direction. [2]

  4. Refraction - Wikipedia

    en.wikipedia.org/wiki/Refraction

    Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction. How much a wave is refracted is determined by the change in wave speed and the initial direction of wave propagation relative to the direction of change in speed.

  5. Mass in special relativity - Wikipedia

    en.wikipedia.org/wiki/Mass_in_special_relativity

    A so-called massless particle (such as a photon, or a theoretical graviton) moves at the speed of light in every frame of reference. In this case there is no transformation that will bring the particle to rest. The total energy of such particles becomes smaller and smaller in frames which move faster and faster in the same direction.

  6. Fermat's principle - Wikipedia

    en.wikipedia.org/wiki/Fermat's_principle

    The ordinary law of refraction was at that time attributed to René Descartes (d. 1650), who had tried to explain it by supposing that light was a force that propagated instantaneously, or that light was analogous to a tennis ball that traveled faster in the denser medium, [44] [45] either premise being inconsistent with Fermat's.

  7. Faster-than-light - Wikipedia

    en.wikipedia.org/wiki/Faster-than-light

    Faster-than-light (superluminal or supercausal) travel and communication are the conjectural propagation of matter or information faster than the speed of light in vacuum (c). The special theory of relativity implies that only particles with zero rest mass (i.e., photons ) may travel at the speed of light, and that nothing may travel faster.

  8. Strange light phenomenon seen before some earthquakes is a ...

    www.aol.com/news/strange-light-phenomenon-seen...

    In most cases, the phenomenon was observed shortly before or during the seismic event, and it was visible up 600 kilometers (372.8 miles) from the quake epicenter.

  9. Twin paradox - Wikipedia

    en.wikipedia.org/wiki/Twin_paradox

    The twin on the ship sees low frequency (red) images for 3 years. During that time, he would see the Earth twin in the image grow older by 3/3 = 1 year. He then sees high frequency (blue) images during the back trip of 3 years. During that time, he would see the Earth twin in the image grow older by 3 × 3 = 9 years.