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In special relativity, a faster-than-light particle would have spacelike four-momentum, [3] unlike ordinary particles that have time-like four-momentum. While some theories suggest the mass of tachyons is imaginary , modern formulations often consider their mass to be real, [ 14 ] [ 15 ] [ 16 ] with redefined formulas for momentum and energy.
Faster-than-light (superluminal or supercausal) travel and communication are the conjectural propagation of matter or information faster than the speed of light (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.
Faster-than-light travel and communication Superluminal motion, faster-than-light motion; Superluminal communication, faster-than-light communication; FTL: Faster Than Light, a 2012 indie roguelike video game; Faster Than the Speed of Light: The Story of a Scientific Speculation, a book by João Magueijo "Faster Than the Speed of Light", a song ...
Transversal time dilation. The blue dots represent a pulse of light. Each pair of dots with light "bouncing" between them is a clock. In the frame of each group of clocks, the other group is measured to tick more slowly, because the moving clock's light pulse has to travel a larger distance than the stationary clock's light pulse.
The speed of light is the upper limit for the speeds of objects with positive rest mass, and individual photons cannot travel faster than the speed of light. [39] This is experimentally established in many tests of relativistic energy and momentum .
Very light and delicate leggiero or leggiermente Light or lightly (the different forms of this word, including leggierezza, "lightness", are spelled without the i in modern Italian, i.e. leggero, leggerissimo, leggermente, leggerezza.) leidenschaftlich(er) (Ger.) (More) passionately lent (Fr.) Slow lentando Gradual slowing and softer lentissimo ...
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The child wants to "become one with light", but the speed of light is too fast for the child. This is solved through the use of magic orbs which, as each are collected, slow down the speed of light, until by the end it is at walking speed. [3] These orbs are spread throughout the level.