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But we cannot receive signals from those parties and places outside our past light cone.

Another definition is that the light cone represents all possible worldlines.

They are defined by the set of light cones (see the image on the left).

A similar process led to the construction of the light cone as a characteristic surface for the wave equation.

"You know those light yellow cones of sand we've been seeing?"

The first plant he looked at had a number of light cones, each looking suitable for ice cream.

Elsewhere is the region between the two light cones.

The top of the light cone tells where the light from the event will travel.

The center of the light cone is the event.

The origin and all events on the light cone are self-orthogonal.