The "space is cold" thing is actually a pretty good shibboleth for people who don't know that much about engineering things in space. Most space systems have to

The "space is cold" thing is actually a pretty good shibboleth for people who don't know that much about engineering things in space. Most space systems have to put in effort to reject excess heat than to hold onto basic amounts, hence those giant radiators and the high emissivity paint that gets used on most things.