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To conduct heat, a medium is required (e.g. Atmosphere)

But at higher altitudes atmosphere is too thin, yet Wikipedia states temperatures in the thermosphere can rise to 2,000$^{\circ}$C

Electromagnetism can travel through vacuum, but is thermodynamics that simple? ISS uses radiators for thermal control, how do those "radiate" heat?

Is it just "radiation"?

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    $\begingroup$ "How is the Sun's heat transmitted to Earth?" is the first question you should be asking yourself. $\endgroup$ – Andrew Thompson Mar 21 '17 at 6:52
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    $\begingroup$ I think there are several questions and some good answers about this already - it might be good to do a search within SXSE. $\endgroup$ – uhoh Mar 21 '17 at 9:14
  • $\begingroup$ @uhoh It would be a better idea to define entropy for him. $\endgroup$ – Raze Mar 22 '17 at 6:53
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    $\begingroup$ @Raze go for it. I have so much entropy in my head that I can't wrap my mind around it. $\endgroup$ – uhoh Mar 22 '17 at 10:26
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    $\begingroup$ @uhoh I am afraid there is just as much entropy in my head than as it is in your head. $\endgroup$ – Raze Mar 22 '17 at 16:36