Terakelvin
It looks like Stephen Hawking, Bill Nye, and Neil deGrasse Tyson are about to drop an album.
h/t Tad D.
(see also What’s the story behind this picture? • Quora)
…although, yeah, you can measure very cold things in Kelvin, too. So I guess they should’ve said “…so hot they have to express the temperature in terakelvin….”