Figure 3: This figure shows a number of light cones and future-pointing outgoing null
geodesics in a neighborhood of the event horizon in Schwarzschild spacetime, plotted in ingoing
Eddington–Finkelstein coordinates . (These coordinates are defined by the conditions that
is an ingoing null coordinate, while is an areal radial coordinate.) Note that for clarity
the horizontal scale is expanded relative to the vertical scale, so the light cones open by more than
. All the geodesics start out close together near the event horizon; they diverge away from each
other exponentially in time (here with an -folding time of near the horizon). Equivalently,
they converge towards each other if integrated backwards in time (downwards on the page).
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