I don't really understand the general theory of relativity (GTR) really deeply, but according to my understanding, the GTR say that gravitation is caused by the curvature of spacetime by objects with mass. This makes some sense when you are talking about a moving object having it's course changed by the gravitational influence of another object. It seems that gravity is changing which direction is "forward" for the moving object and the moving object just continues to move "forward". However, what does this mean for objects that fall toward the Earth with no horizontal component to their motion? The object wasn't moving relative to the Earth, so how can gravity change the meaning of "forward" for the object? If gravity doesn't change the object's location in space during the fall, do the Earth and other objects with mass "suck in" spacetime?