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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.

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.

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 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 principle stating that the gravitational force as experienced locally while standing on a massive body (such as the Earth) is equivalent to the pseudo-force experienced by an observer in a non-inertial (accelerated) frame of reference.

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.

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.