1) Speedy subatomic particle
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https://www.crosswordclues.com/clue/tachyon
A tachyon n or tachyonic particle is a hypothetical particle that always moves faster than light. The word comes from the ταχύς or tachys, meaning `swift, quick, fast, rapid`, and was coined in 1967 by Gerald Feinberg. The complementary particle types are called luxon (always moving at the speed of light) and bradyon (always moving slower t.....
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http://en.wikipedia.org/wiki/Tachyon
[software] Tachyon is a parallel/multiprocessor ray tracing software. It is a parallel ray tracing library for use on distributed memory parallel computers, shared memory computers, and clusters of workstations. It was originally developed at the University of Illinois at Urbana–Champaign. It is released under a permissive license (includ...
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http://en.wikipedia.org/wiki/Tachyon_(software)
A hypothetical particle of imaginary mass whose velocity always exceeds the speed of light. Tachyons have never been observed. 1
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http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A
hypothetical subatomic particle whose velocity always exceeds that of light. The existence of the tachyon, though not experimentally established, ...
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http://www.britannica.com/eb/a-z/t/2
A hypothetical particle that travels faster than the speed of light (and therefore also travels back in time). The existence of tachyons is allowed by the equations of Einstein's special theory of relativity. However, although searches have been carried out for tachyons, the results have so far prov...
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http://www.daviddarling.info/encyclopedia/T/tachyon.html
A tachyon is a theoretical particle that always travel faster than light.
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http://www.probertencyclopaedia.com/browse/GT.HTM
A tachyon is a theoretical particle that always travels faster than light. See also: Velocity of Light in Vacuo.
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https://www.encyclo.co.uk/local/20687
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