Also of note is that while a vacuum doesn't necessarily have a temperature (it's just a medium), space does. Even if you go far away from anything else, you wi

Also of note is that while a vacuum doesn't necessarily have a temperature (it's just a medium), space does. Even if you go far away from anything else, you will still reach thermal equilibrium at the Cosmic microwave background (CMB) temperature, which is 2.7K -- it's essentially the "temperature of the universe", radiation which has been emitted as far back as the first moments of the universe. And of course, if you create a vacuum chamber on Earth, any object inside will always reach equilibrium at ambient temperature (in the lack of any heat engines on the body -- even then the fuel would deplete some time).