  The properties of heavy quark systems change if they are placed in a medium
other than the low energy vacuum. In a hot Quark Gluon Plasma $J/\Psi$
particles will melt and not exist as resonant states. $\Upsilon$'s, however,
because of their smaller size and the dominance of the Coulomb potential, will
still form as $Q\bar Q$ bound states but their properties will shift. In
particular the $\Upsilon$ mass may be shifted upward by over 100 MeV. If such
excited states manage to escape from the plasma as a superheated particle, they
may serve as a diagnostic of the plasma in which they originated. We propose
that such a scenario is possible and that hot $\Upsilon$'s will form and
escape, thereby providing us with crucial information about the Quark Gluon
Plasma.
