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We report the evidence for the existence of the universal, continuousturbulent cascade of velocity fluctuations with Kolmogorov -5/3 slope spanning6 orders of length scales, from $10^4$ pc down to $10^{-2}$ pc. This wasachieved by applying our innovative technique of separating density andvelocity fluctuations to a set of spectroscopic surveys featuring variousgalactic spectral lines. This unified velocity cascade involves differentinterstellar phases from diffuse galactic media to dense self-gravitatingclouds and persists despite interstellar phase transitions. However, theturbulent density fluctuations do not show this universality as the value ofthe spectral slope changes in different interstellar phases. This agrees withthe expectation of compressible turbulence theory and demonstrates that thedensity is only an indirect tracer of interstellar turbulence. We report thatthe density fluctuations for clouds and filaments that are preferentiallyparallel to magnetic fields exhibit the spectral slope of -2. The universalgrand turbulent velocity cascade that is established in our paper hassignificant implications for key galactic physical processes, including starformation, cosmic ray transport etc. We anticipate our result to be a startingpoint for in vitro models of multiphase interstellar turbulence studies with asignificant impact for modeling of spiral galaxies.

Turbulent universal galactic Kolmogorov velocity cascade over 6 decades