| The easiest
way to conceptualize the effects of general relativity is by the use
of simple space-time diagrams called light-cones. Light cones consist
of three axes, two for the planer spatial dimension and one temporal.
The spatial axes represent the absolute position of a "point event"
in the two disentail plane relative to other "point events" at that
same "moment". The temporal axis allows the |
 |
positions
of theses "point events" to change with time relative to each other.
Say that we wanted to know everything about a particular "point event"
on the space time diagram to do this we would ideally like to know
all the events in the past that affected that "point event" to do
this we must look at the way events in the past affect the "present".
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