@Vivace
Well I said ‘technically’ because space doesn’t
have a temperature. Space is a vacuum, and you can’t heat a vacuum.
Things IN space however, get hot. A steel surface in earth orbit will heat to 250 degrees Fahrenheit, which is the point where the heat it’s losing via infrared radiation equalises with the energy it’s absorbing from the sun. It’s why spaceships are shiny, spin (to reduce the time any one area is being heated) and have lots of thermal radiators, if they didn’t they would cook.
Around Mars it’s a little over 70 degrees, which is still reasonably warm considering.
There’s also the fact that you lose heat pretty slowly in space, and lose heat slower the colder you are. Even in deep space away from a star, spaceship design has to take into account the fact that very hot objects (like a reactor, or extensive electronics) will heat a spaceship up beyond human tolerances unless some kind of active cooling system is put in place.
In comparison, you lose heat very quickly in a cold environment within an atmosphere, because you’re actively being cooled by the airflow and the surfaces you’re touching.