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We present an exact solution to the equations of massive gravity thatdisplays cosmological constant-like behavior for any spherically symmetricdistribution of matter, including arbitrary time dependence. On this solution,the new degrees of freedom from the massive graviton generate a cosmologicalconstant-like contribution to stress-energy that does not interact directlywith other matter sources. When the effective cosmological constantcontribution dominates over other sources of stress energy the cosmologicalexpansion self-accelerates, even when no other dark-energy-like ingredients arepresent. The new degrees of freedom introduced by giving the graviton the massdo not respond to arbitrarily large radial or homogeneous perturbations fromother matter fields on this solution. We comment on possible implications ofthis result.

Self-accelerating Massive Gravity: Exact solutions for any isotropic matter distribution