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{{General relativity sidebar |fundamentals}}
The '''world line''' (or '''worldline''') of an object is the [[path (topology)|path]] that
The concept of a "world line" is distinguished from concepts such as an "[[orbit]]" or a "[[trajectory]]" (e.g., a planet's ''orbit in space'' or the ''trajectory'' of a car on a road) by the ''time'' dimension, and typically encompasses a large area of spacetime wherein [[perception|perceptually]] straight paths are recalculated to show their ([[Principle of relativity|relatively]]) more absolute [[position states]]—to reveal the nature of [[special relativity]] or [[gravitation]]al interactions.
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