Last time, he survived the sun. There are much hotter ones like a Wolf-Rayet star (*)...
But... We need something more definitive.
I remember the Kaioshin technique, I saw it... Yes...
You and I are going for a little trip!
What?!?
(*) Remember Gohan is in there, and he studied many things! The sun surface temperature is 5,600° celsius, and a Wolf-Rayet star can be at 200,000°. We also have *bigger* stars than the sun, more than 1,500 times, but they are actually less hot.