The term correctly refers only to the evolution of life, except as an analogy.Yes, I'm aware that evolution generally refers to the evolution of life, and is therefore in the field of biology -ie Macroevolution.
BTW - the term "macroevolution" is meaningless. It's based on an arbitrary distinction by creationists meaning "that part of the established theory of evolution that even a creationist can't disagree with without looking foolish or deceitful."
No, you don't.However, when we contrast in to creationism, we begin talking about Cosmic, stellar, etc. evolution.
I think you've gotten yourself a bit confused here. Yes, evolution makes certain predictions about things like the age of the Earth. So do other disciplines of science... plate tectonics, for instance. However, that doesn't make the initial formation of the Earth "planetary evolution" any more than it makes it "planetary tectonics".For example, macroevolution that you're talking about could only have happenned without a fairly large amount of time -without that time, the theory is sunk. Creationism purports that there was not that much time. Thus, we begin talking about the lot of evolutions.