[b]It depends on "WHEN" you measure such things![/b]
On a typical day, the white dwarf, at the heart of the Red Spider Nebula (NGC 6537) is around 300,000 Kelvin or 539,540 Fahrenheit. That's about 50 times hotter than our sun:
Quasar 3C-273 is even hotter. New observations show temperatures in the jet of this quasar to reach 10 trillion Kelvin or 18 trillion Fahrenheit:
If you just happened to visit the CERN particle accelerator, in July of 2012, you would have been present to see, briefly, the production of a quark-gluon plasma explosion, that had a temperature of about 5.5 trillion Kelvin or 9.9 trillion Fahrenheit:
Lastly; if you could had been present, during the Big Bang, you would have observed the Planck temperature of 1.416E32 Kelvin.
That's roughly 100 million million million million million degrees!
