I strongly believe in the Einstein's theory that gravity is a wave that it bends light and the object having mass warp the space-time giving it a curvature. But one thing I'm not sure about is why it is said gravity is not a force? Experimentally, the Galileo's trial is right that if a feather and a ball are dropped from a certain height in absence of any material medium then both will take equal time to make an impact on the surface towards which it is falling. But please clarify if gravity is not a force then why any object falls towards earth's surface? or maybe I'm wrong or misunderstood it. Please clarify.