Theories come in two forms. A theory in the scientific sense doesn't have anything to do with whether or not it is supported by evidence, contradicted by the evidence,or even if the theory is well liked. It only has to do with the way the theory is structured and the way it functions. Just because a theory is a scientific theory does not mean that the scientific community currently accepts it. There are many theories that are scientific, but have been rejected by the scientific community because the evidence is strongly against it. Phenomenological theories are observational generalizations of data. These theories only describe the processes that nature keeps repeating but do not explain their causes or mechanisms. Phenomenological theories are also called scientific laws, physical laws, and natural laws. Newton’s third law is one example of a phenomenological theory. It states that every action has an equal and opposite reaction. Explanatory theories attempt to explain the observations rather than generalize them. Whereas laws are descriptions of observational regularities, explanatory theories are conceptual constructions to explain why the data exist. For example, the atomic theory explains why we see certain observations. The same could be said with DNA and relativity. Explanatory theories are particularly helpful in such cases where the entities (like atoms, DNA, and so forth) cannot be directly observed.
Scientists at Massachusetts Institute of Technology and the National Institute of Standards and Technology (NIST) reported in Dec. 22, 2005 of the journal Nature that Albert Einstein's formula, E=mc2, was correct.
The researchers used an instrument developed by NIST (Gaithersburg, Md.) called GAMS4 (click link below for image) to again confirm that energy and matter are related: energy (E) equals mass (m) times the square of the speed of light (c2). Full article at http://www.eetimes.com/news/latest/showArticle.jhtml;jsessionid=PK0GDDIIC0P4EQSNDBESKHA?articleID=175007386
Image at
http://i.cmpnet.com/eet/news/online/2005/12/image1_122005.jpg