The obvious answer is one year as the speed of the oh-my-God (OMG) particle was calculated to be about 0.999,999,999,999,999,999,999,995,1c.

However, at this speed, from the frame of the particle, one light year distance should be reduced to almost zero according to the idea of length contraction in special relativity. Thus with no distance to travel the particle should travel the distance in no time.

What is the correct answer? About zero or one year?

Please see pages 15-19 of a presentation material https://www.researchgate.net/profile/Ziaedin_Shafiei/project/Special-Relativity-

It provides a brief analyses of the consequences of the mount Washington experiment which conducted to prove time dilation and length contraction.

Frisch, D. H.; Smith, J. H. (1963). "Measurement of the Relativistic Time Dilation Using μ-Mesons". American Journal of Physics. 31 (5): 342–355.

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