Two crazy ideas: 1. Dark matter is the "gravity echo" from the past. Gravity is the structural bending of spacetime by mass. The effect of the bending is sup

Two crazy ideas: 1. Dark matter is the "gravity echo" from the past. Gravity is the structural bending of spacetime by mass. The effect of the bending is supposed to travel at the speed of light. What if the effect has been delayed and is added to the present effect? 2. When a mass is moving through spacetime, the bending of spacetime is asymmetric in the leading and trailing directions, where the leading direction forms a leading crust and trailing forms a flatter tail, just like the blue-shift and red-shift effects on light. The leading gravity wave crust adds to the strength of the gravity.