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Old November 3 2012, 08:05 PM   #994
CorporalCaptain
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Re: Star Ship Polaris

sojourner wrote: View Post
^Heat radiators, by their nature, are not in equilibrium with their environment.
True, but, without sidetracking the thread, from http://en.wikipedia.org/wiki/Black-body_radiation:

Although planets and stars are neither in thermal equilibrium with their surroundings nor perfect black bodies, black body radiation is used as a first approximation for the energy they emit.[5] Black holes are near-perfect black bodies, and it is believed that they emit black-body radiation (called Hawking radiation), with a temperature that depends on the mass of the hole.[6]
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