:doh:

when will you people understand this? its a theory because we don't know everything about it. you see, evolution encompasses A LOT. so does space. so lets try for an allegory here.

we know that we live in a solar system, that is within a galaxy that holds thousands of other solar system. then there's the local group, then the virgo cluster, blah blah blah i'm getting off track. anyways, we have a pretty good concept of how each solar system is created, how a lot of things work, etc, but we just don't know everything, nor we probably ever will. two main reasons for this: the universe is enormous, and looking into its depths are incredibly difficult. also, these things happen so slowly over time that its almost impossible to prove. so they are educated guesses, albeit very good ones, so we call them theories.

evolution is very similar. we have a good portion of the puzzle, but there are pieces missing. a lot of the things we do know for a fact (compare to that the earth revolves around the sun, there's a big black hole in the middle of our galaxy, etc.) but some things we don't know or are impossible to prove definetly.

so, in essence, we know that evolution exists. we can see it in fossils, and even micro evolution within the past 100 years. macroevolution we have pretty good ideas about, but they are almost impossible to prove. this is why we call "evolution" a theory.

and if you still don't get it then you are just plain stupid.