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A set of ten interrelated differential equations that describe the fundamental interaction of gravitation as a result of space-time being curved by matter and energy.

A phenomenon where light from a distant source is bent around a massive object between the source and the observer, much like a lens, due to the effect of the mass on space-time.

Ripples in the curvature of space-time which propagate as waves outward from their source at the speed of light, produced by certain movements of mass, especially when large masses accelerate.

The process by which rotating masses can 'twist' nearby space and time around them, predicted by General Relativity and confirmed by experiments such as Gravity Probe B.

A term added by Einstein to his field equations of General Relativity, representing an unknown force that counteracts gravity on a cosmological scale, now associated with the concept of dark energy.

The difference in the elapsed time as measured by two observers, due to the variation in gravitational potential; the higher the gravity, the slower the time passes.

The shortest path between two points in curved space-time, which is the path a free-falling object follows under gravity's influence without any forces acting upon it.

The radius of the event horizon of a non-rotating black hole, beyond which nothing can escape the gravitational pull, not even light.

The manifestation of gravity as geometry of space-time as described by General Relativity, where mass and energy can 'bend' the fabric of space and time.