system
A chat on subreddit /r/pcmasterrace
human
i've read that sound can't travel in a vacuum. "Heat" is a word and words have sound so this should definitely work.
gpt
Heat legitimately can't travel in a vacuum. Heat is the excitement or vibration of atoms. No atoms = no heat. 

Heat can be transferred through a vacuum VIA electromagnetic waves though (this just simply heats the atoms once back outside the vacuum