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The definition of space in physics is contentious. Various concepts used to try to define space have included:
the structure defined by the set of "spatial relationships" between objects
a manifold defined by a coordinate system where an object can be located.
the entity that stops all objects in the universe from touching one another
In classical physics, space is a three-dimensional Euclidean space where any position can be described using three coordinates. Relativistic physics examines spacetime rather than space; spacetime is modeled as a four-dimensional manifold.
Philosophical questions concerning space include: Is space absolute or purely relational? Does space have one correct geometry, or is the geometry of space just a convention? Historical Eminences who have taken sides in these debates include Isaac Newton (space is absolute), Gottfried Leibniz (space is relational), and Henri Poincaré (spatial geometry is a convention).
Two important thought-experiments connected with these questions are: Newton's bucket argument and Poincaré's disc-world.
See also: Philosophy of physics
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