RT fingers evident in the Crab Nebula

"The Rayleigh–Taylor instability, or RT instability (after Lord Rayleigh and G. I. Taylor), is an instability of an interface between two fluids of different densities, which occurs when the lighter fluid is pushing the heavier fluid. This is the case with an interstellar cloud and shock system. The equivalent situation occurs when gravity is acting on two fluids of different density — with the dense fluid above a fluid of lesser density — such as water balancing on light oil. " Wikipedia.

\exp(\gamma\,t)\;, \qquad\text{with}\quad 
\gamma={\sqrt{\mathcal{A}g\alpha}} \quad\text{and}\quad 

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