[ELI5] Would something stay hot in the space forever since there is nothing to transfer its heat?

Question

[ELI5] Would something stay hot in the space forever since there is nothing to transfer its heat?

In: 169

Answer 1

Heat can radiate through empty space (hence the warmth of the sun). Heat can also conduct through matter much faster, but it will still go through nothingness.
Experiment – put some hot water in a bottle, and some more in a vacuum thermos. The water in the thermos will cool much slower than the one in the bottle, but it will still cool .