[Revised entry by Erik Curiel, Manus Visser, and Juliusz Doboszewski on July 13, 2025.
Changes to: Main text, Bibliography, holes-in-spacetime.html, non-standard-singularities.html, notes.html]
A spacetime singularity is a breakdown in spacetime, either in its geometry or in some other basic physical structure. It is a topic of ongoing physical and philosophical research to clarify both the nature and significance of such pathologies. When it is the fundamental geometry that breaks down, spacetime singularities are often viewed as an end, or “edge”, of spacetime itself. Numerous difficulties, however, arise when one tries to make this notion more precise. Breakdowns in other physical structures pose other problems,…

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