  The topic of this conference is ``The Chaotic Universe''. One of the main
achievements of last century has been to relate chaos in fluids to their
thermodynamics. It is our purpose to make connection between chaos in
gravitation and standard thermodynamics. Though there have been many previous
steps and attempts, so far no convincing conclusion has been reached.
  After explaining how the approach works for glasses, we shall discuss the
thermodynamics of two specific systems: black holes and globular star clusters.
In both cases we point out that the dynamics satisfies the first and second law
of thermodynamics, though negative specific heats occur.
