Every event has a cause.

Every cause has an effect.

The cause and effect are always proportional.

The cause and effect are always simultaneous.

The curvature of spacetime.

The presence of mass and energy.

The interaction of particles.

The expansion of the universe.

A four-dimensional continuum combining space and time.

A three-dimensional space with time as a separate dimension.

A two-dimensional plane representing space and time.

A one-dimensional line representing time.

It causes objects to accelerate.

It causes objects to decelerate.

It causes objects to move in straight lines.

It causes objects to move in curved paths.

The laws of physics are the same for all observers in uniform motion.

The laws of physics are different for observers in different reference frames.

The laws of physics depend on the observer's position in spacetime.

The laws of physics depend on the observer's velocity.

Causality implies determinism.

Determinism implies causality.

Causality and determinism are independent concepts.

Causality and determinism are mutually exclusive concepts.

Event horizons are boundaries beyond which causality breaks down.

Event horizons are boundaries beyond which time stops.

Event horizons are boundaries beyond which space stops.

Event horizons are boundaries beyond which matter disappears.

One twin ages faster than the other due to time dilation.

One twin ages slower than the other due to time dilation.

Both twins age at the same rate regardless of their motion.

Both twins age at different rates depending on their acceleration.

Wormholes are hypothetical tunnels connecting different regions of spacetime.

Wormholes are hypothetical tunnels connecting different universes.

Wormholes are hypothetical tunnels connecting different dimensions.

Wormholes are hypothetical tunnels connecting different galaxies.

The theory that the universe began from a single point.

The theory that the universe began from multiple points.

The theory that the universe has always existed.

The theory that the universe will eventually end.

Quantum gravity is a theory that unifies quantum mechanics and general relativity.

Quantum gravity is a theory that unifies quantum mechanics and cosmology.

Quantum gravity is a theory that unifies quantum mechanics and string theory.

Quantum gravity is a theory that unifies quantum mechanics and particle physics.

A constant term in Einstein's field equations.

A constant term in the Schrödinger equation.

A constant term in the Dirac equation.

A constant term in the Maxwell equations.

Black holes are regions of spacetime where gravity is so strong that nothing, not even light, can escape.

Black holes are regions of spacetime where time stops.

Black holes are regions of spacetime where space stops.

Black holes are regions of spacetime where matter disappears.

A point of infinite density and curvature.

A point of infinite temperature.

A point of infinite pressure.

A point of infinite energy.

Gravitational waves are ripples in spacetime caused by the acceleration of massive objects.

Gravitational waves are ripples in spacetime caused by the expansion of the universe.

Gravitational waves are ripples in spacetime caused by the rotation of the Earth.

Gravitational waves are ripples in spacetime caused by the motion of planets.