Relativistic speed
Relativistic speeds were speeds comparable to the speed of light.

In 2366 on stardate 43125.8, the  entered an unnamed binary star system in the Kavis Alpha sector on a critical mission of astrophysical research. Doctor Paul Stubbs was to attempt to study the decay of neutronium expelled at relativistic speeds from a massive stellar explosion. ()

See also 
 General relativity
 Time dilation
 Warp factor

External link 
 

physics