I'm confused about light cones and I've driven a crazy scenario to try to represent it.
Let's say I can move through my past light cone to the exact time of my birth. If I kept on moving back could I move to a time before I was born? Therefore my question is, when they show light cones in space-time diagrams do they apply to our own past our the past of the time throughout the universe. Does this mean that in the -t direction, time for us only goes as far back as our birth. Sorry if this sounds too confusing.