  Turbulent radiation flow is commonplace in systems with strong, incoherent,
light-matter interactions. In astrophysical contexts, photon bubble turbulence
is considered a key mechanism behind enhanced radiation transport, and its
importance has been widely asserted for a variety of high energy objects such
as accretion disks and massive stars. We demonstrate here that analogous
conditions to those of dense astrophysical objects can be obtained in large
clouds of cold atoms driven close to a sharp electronic resonance. By accessing
the spatially-resolved atom density, we are able to identify a photon bubble
instability and the resulting regime of photon bubble turbulence. We also
develop a theoretical model describing the coupled dynamics of both photon and
atom gases, which accurately describes the statistical properties of the
turbulent regime. This study thus opens the possibility of simulating
radiation-dominated astrophysical systems in cold atom experiments.
