:hole:Event horizons in black holes represent points of no return for photons and particles.
:infinity:Future null infinity defines a boundary beyond which events cannot be reached.
:graph:Causal graphs help visualize the cause and effect relationships in space-time.
:question:Determining black hole event horizons requires evaluating reachable and unreachable events.
:chart_with_upwards_trend:Analyzing code and computational models aids in understanding complex physics concepts.