I don't believe so. I believe gravity will be explained. Gravity is an attractional force between two objects.....something that pulls them together. When you have two objects being pulled together on a macroscopic level, generally there is a definitive explanation as to why. I believe there will be a definitive explanation of gravity similar to why two people at the end of a rope can pull each other tegether.... there is something explainable in between...some form of matter. I also believe matter....though we may not understand it... pulls magnets together like planets by gravity. on the atomic level there is some force which is relayed by matter or anti matter which pulls the two together. If there was no matter... i.e. nothing in between the two..... how could they physically react to one another? Like a person's belief in good and evil, there is also a common sense about physics. Two objects pulled together are pulled by something, not nothing. I hope I'm alive when gravity is defined.