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Old November 3 2012, 08:05 PM   #994
Cookies and Cake
Location: North America
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

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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