Hi all, If I have a hot object in space (not a star but say an oven or just a hot gas as would be on Earth < 10,000 degrees Kelvin) glowing at a temperature T and I want to know long it takes to come to equilibrium with the vacuum of space around it, how can I calculate such a time? I could find the Stephen Boltzmann Law for power radiated but am not sure how to get the time to completely cool off. Seems like it should be easy but it eludes me somehow. Oh also, slight mistake in the title. Its not a plasma I want but either a gas or an object just at some general temperature T.