Space-time

Definition

Space-time is a four-dimensional continuum that fuses the three dimensions of space with the one dimension of time into a single interwoven construct. It is central to Einstein's theory of general relativity, where gravity is described as the curvature of this continuum.

5 Must Know Facts For Your Next Test

1. In Einstein's theory, massive objects cause distortions in space-time, creating what we perceive as gravity.
2. The concept of space-time replaces the Newtonian idea of absolute space and time.
3. Space-time is often represented using a metric tensor that defines distances within this four-dimensional framework.
4. Gravitational waves are ripples in space-time caused by accelerating masses, such as merging black holes or neutron stars.
5. The equations governing the curvature of space-time due to mass and energy are known as Einstein's field equations.

Review Questions

• How does Einstein's theory describe gravity in terms of space-time?
• What role does the metric tensor play in the concept of space-time?
• What causes gravitational waves within the context of space-time?

Related terms

General Relativity: Einstein's theory describing how mass and energy influence the curvature of space-time, leading to gravitational effects.

Metric Tensor: A mathematical object that describes the geometry of space-time and allows for calculations of distance and angles.

Gravitational Waves: Ripples in the fabric of space-time generated by accelerated masses like merging black holes or neutron stars.