[quote=Dynamics]
Regardless, they can't measure that high, and only estimate. Which is likely going to be inaccurate. Plus, Vsauce did a vid about how past a certain temperature, heat may becomes nothing more than pure energy. An "absolute hot," so to speak. Logically, think about it. How likely is it that any amount of space can reach that temperature? And how logical is it to believe that it damaged nothing? Heat is a very fluid energy, and expands rapidly.
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Heat is not energy, nor does it expand. Heat is the measure of how fast a particle is moving. Thermal Energy is the sum total of all the kinetic energy of an object. So however fast the particles are moving, that'a how hot they are. Vsauce is wrong in this respect. As a substance gets "hotter", it's actually moving faster, which is why solid turns into liquid turns into gas, and hot gas expands more quickly than cold gas. As you get hotter, you get plasma, and eventually you can get so hot that the protons and neutrons rip themselves apart into quarks and gluons. Heat can't just become pure energy. Heat is simply the speed of atoms. Thermal Energy isn't even its own energy, if you think about it. It's just the total of the kinetic energy. And since according to the kinetic-molecular model, atoms are always in movement and can't not be moving (otherwise they won't be atoms) the kinetic energy can't just escape and turn into "pure energy". And even that is a misnomer. Energy is the ability to do work. In the case of kinetic energy, that work is movement.

Wow, that was long. TL;DR: "Absolute Hot" is impossible because heat is not energy.