>I very much agree though, that is is important to recognize that most of it is still only theory.

Tracy:

Theory is the best you can hope for in science. It is the most coveted state for an hypothesis. So when you say Theory it is high praise indeed.

Einstein's Theory of Relativity has been proven correct so far with some limited experimental data. It is a Theory because it can be arrived at independently, can be corroborated, can make predictions of things or events that come to pass, and it can be falsified. In layman's terms, Scientific Theory is the closest to the Facts as we know them that you can get.

As with any Theory, if new items come to light that disprove it (i.e. make it fail) and a new Theory comes out that better explains observations and can make better, more accurate predictions then it will supersede it.