My heatsink case is cool to the touch these days, over the summer it was nearly too hot to touch. I thought it was down to the weather, but there is clearly more to it ;)
OpenBSD is very well documented. The kernel and software stack is integrated. They care about security and write a lot of secure stuff used in other systems. There is usually one way of doing things. You do not need StackExchange.
Outer space is pretty much a nuclear furnace with no gravity, not a very appealing place to go. I haven't heard of an serious solutions to either of those problems.