Editing General Relativity (section)

== <span style="color: #FFFFFF;">Remembering</span> ==
* '''Spacetime''' — The four-dimensional continuum combining three dimensions of space and one dimension of time.
* '''Equivalence Principle''' — The principle that gravity and acceleration are locally indistinguishable.
* '''Curvature''' — The bending of spacetime geometry in the presence of mass/energy.
* '''Metric Tensor (gμν)''' — A mathematical object that defines the distance between points in curved spacetime.
* '''Geodesic''' — The shortest path between two points in curved spacetime; the path followed by a free-falling object.
* '''Einstein Field Equations''' — The core equations of GR relating spacetime geometry to energy-momentum distribution.
* '''Event Horizon''' — The boundary surrounding a black hole beyond which nothing can escape.
* '''Gravitational Redshift''' — The stretching of light's wavelength as it moves out of a gravitational well.
* '''Singularity''' — A point of infinite density and curvature where the laws of GR break down.
* '''Gravitational Waves''' — Ripples in the fabric of spacetime caused by accelerating massive objects.
* '''Time Dilation (Gravitational)''' — The phenomenon where time passes slower in stronger gravitational fields.
* '''Schwarzschild Radius''' — The radius of the event horizon for a non-rotating, spherically symmetric mass.
* '''Cosmological Constant (Λ)''' — An energy density of empty space introduced by Einstein to allow for a static universe.
* '''Lensing (Gravitational)''' — The bending of light from distant sources by massive foreground objects.
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