  This work is based on stability analysis of spherically symmetric collapsing
star surrounding in locally anisotropic environment in $f(R,T)$ gravity, where
$R$ is Ricci scalar and $T$ corresponds to the trace of energy momentum tensor.
Field equations and dynamical equations are presented in the context of
$f(R,T)$ gravity. Perturbation schem is employed on dynamical equations to find
the collapse equation. Furthermore, condition on adiabatic index $\Gamma$ is
constructed for Newtonian and post-Newtonian eras to address instability
problem. Some constraints on physical quantities are imposed to maintain stable
stellar configuration. The results in this work are in accordance with $f(R)$
gravity for specific case.
