Snapshot from a simulation of a relativistic proton beam (spheres) moving from left to right through a cloud of electrons (gold wires). See article 130405 and Physical Review Focus story at

From the article:

Noninvariance of Space- and Time-Scale Ranges under a Lorentz Transformation and the Implications for the Study of Relativistic Interactions
J.-L. Vay
Phys. Rev. Lett. 98, 130405 (2007)

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