[JeffAtlanta]

You still don't understand the scientific meaning of the word "theory". Looking it up in a dictionary isn't going to help. Look it up in a science textbook and see what it really is.

Tell me this, can a scientific theory ever be proved? If so, what does it become?

[The Bard]

Tell me this, can a scientific theory ever be proved? If so, what does it become?

I am not a scientist, so again I defer to my old science teacher who said "A Scientific theory can be proven once it can be duplicated."

Pasteur's experiments can be duplicated, and if the same steps are followed, each time you will receive the same results (and his findings blow a hole in the idea of spontaneous generation).