@#742064:
I am a professional astronomer, and know many people on the NRAO scientific staff. You appear to have completely misunderstood whatever they told you (assuming that you do indeed work there).
We know the temperature of the center of the Earth from the amount of heat that comes out of the Earth and from the pressure and density of the material there, as measured by seismometers on the surface. It's about 5430 C down there (see http://en.wikipedia.org/wiki/Inner_core#Temperature for an accessible discussion).
We know the temperature of the visible surface of the Sun by direct observation - it's about 5500 C. NRAO observations of the Sun focus mostly on its upper atmosphere, where the temperature is much higher but the material is diffuse enough for radio waves to escape to space.
We know the temperature of the interior of the Sun three separate ways: first, the amount of heat the Sun puts out; second, the pressure and density of the interior measured from helioseismology (see Wikipedia's article on that for a description), and third, from the spectrum of neutrinos produced during the fusion reactions in the Sun's core, as measured by neutrino observatories on Earth. The temperature of the Sun's core is ~16 million C.
Also: if hell is not a physical place, it is by definition not real. And so all discussions about its temperature are totally irrelevant.
Re. the OP:
The LHC accelerates protons to kinetic energies of 7 tera-electron-volts. Since temperature is simply a way of labeling the mean kinetic energy per particle, we can express that as a temperature of ~80 quadrillion Kelvin / Celsius. That ends up being about 4 trillion times hotter than the center of the Sun.
But temperature isn't really a useful description of what's going on in the LHC, since it is nowhere near thermodynamic equilibrium.