That is a theory of RELATIVITY.
Go ahead and post the accepted theory of gravity, the one that says why objects are attracted to each other. We already have the LAW describing how fast they move in that attraction, but we do not have an accepted theory that tells us why.
1.A law is an observation; a theory is the explanation of that observation.
2.A theory requires experimentation under various conditions. A law has no such requirements.
3.A theory may become obsolete with time. This is not the case with a law.
4.A theory can be replaced by another better theory; however, this never happens with a law.
5.A theory may be strong or weak according to the amount of evidence available. A law is a universally observable fact.
Read more: Difference between Theory and Law | Difference Between http://www.differencebetween.net/miscellaneous/culture-miscellaneous/difference-between-theory-and-law/#ixzz72ndiaQy2