I haven't seen this answered yet so here goes...What if Cooper never sent the coordinates to himself? When he's in the tesseract, he surely remembers receiving the coordinates of NASA. But suppose he never sends the coordinates...how would he get to the tesseract in the first place? At the moment of his decision, would he be instantly transported back to his home before the message (is never) sent?

I haven't seen this answered yet so here goes...In Interstellar, what if Cooper never sent the coordinates to himself? When he's in the tesseract, he surely remembers receiving the coordinates of NASA. But suppose he never sends the coordinates...how would he get to the tesseract in the first place? At the moment of his decision, would he be instantly transported back to his home before the message (is never) sent?