My sister texted me late last night: What’s the internal temperature of a tauntaun? Now, Nerd Sister, being a nerd, frequently texts me things like this. Recently, it was questions about the Sword of Shannara series and why Kryptonite hurts Superman, being that he’s from Krypton. So I treated it like any of her other questions: with a degree of critical integrity. It would have to keep Luke warm in the frigid wastes of Hoth until Han got the shelter up, right? Hmm. Warm enough that it would maintain human core…