My knowledge of physics is minimal: if you step off a cliff you drop straight down, and if you're on a motorcycle and hit an immovable object, your body keeps going if there is no wall in front of you.

One thing on this subject has always made me wonder...

In extremes of temperature, would multiple+multiple+multiple layers of insulation prevent something from freezing or overheating, or would the outside ambient temperature still get to the item over time (maybe more slowly, but eventually).

To mitigate that, may I assume that you would need some source of coolness to keep something cool, and some source of heat to keep something from freezing?

I have always assumed this was the case, but when I ask people a question like this, I always get funny looks, like they're thinking, "Why would it matter?"