The Theory of Black Matter - The theory of black matter was created to account for the "unknown" matter in the universe. The basis of this theory is that there must be matter/mass which doesn't emit electromagnetic radiation (such as light), so we can't see it. This theory has recently evolved, with the new theory called "Emergent Gravity". The new theory invented by Erik Verlinde, states that Erik Verlinde surprised the world with a completely new theory of gravity. According to Verlinde, gravity is not a fundamental force of nature, but an emergent phenomenon. In the same way that temperature arises from the movement of microscopic particles, gravity emerges from the changes of fundamental bits of information, stored in the very structure of spacetime. And According to Erik Verlinde, there is no need to add a mysterious dark matter particle to the theory. 

The major challenges of this theory is the absolute inability to collect results. Also, since they are measuring space activities it is even harder to collect results. However, Erik Verlinde struggled very hard to collect these results since they involved finding the velocity of planets and etc. The methods of questioning Verlinde used were perhaps reasoning and faith. This new research might lead to the complete scrapping of the Black Matter Theory.

This proves the difference between a theory and law. A theory can be proved/disproved and change over time, whereas a law is fixed and true.