Surface of the Sun - 6000 C
Center of the Sun - 15000000 C
> The temperature in the corona is more than a million degrees, surprisingly much hotter than the temperature at the Sun's surface which is around 5,500° C
With sufficiently efficient fuel, the fastest path from A to B is by constantly accelerating (more or less) towards it until you reach halfway, then flipping and constantly decelerating until you arrive.
Under this kind of trajectory, you're under constant acceleration of, say, 1g the whole time. This means you effectively have gravity for the entire trip, as long as you've designed your ship such that the floor is in the same direction as you apply thrust - think less traditional ship decks and more like a skyscraper.
Another realistic option, of course, is a rotating section. But this generally requires massive, "ugly" ships to work so it's pretty rare in fiction.
Barring other species as intelligent as ours elsewhere (which is of course possible, but unknown), the very hottest thing in the entire unimaginably-large universe full of exotic stars and black holes and supernovae, was created by a tiny group of apes on a minuscule planet orbiting a smallish, boring star on the unfashionable side of a galaxy.
Per Wiki:
> The energy of this particle is some 40 million times that of the highest energy protons that have been produced in any terrestrial particle accelerator.
Presumably wherever these extreme energy protons are coming from is rather warm.
Is there some reason to think the LHC has higher temperature?
Not a physicist; could be something like LHC having larger bunch sizes... but since we don’t know what causes these particles, it seems like we don’t really know the source temperature.