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A universe whose cosmological scale factor increases over time; observationally inferred through redshift-distance relations and other cosmological data.
wp-physics-expanding-universenasa-big-bangnasa-dark-energyEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Solutions with increasing scale factor describe cosmic expansion.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
nasa-big-bangnasa-dark-energyEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Expansion combined with thermal and nuclear evidence supports the hot Big Bang framework.
The source experiment, observation, anomaly, or problem materially motivated the development, revision, or acceptance of the target concept. Historical influence is not logical derivation; the edge detail states the documented role and avoids retrospective origin myths.
nasa-big-bangThis is an authored directed relation from the source endpoint to the target endpoint.
For comoving emission and observation in an FLRW model, expansion changes photon wavelength by the scale-factor ratio .
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-cosmological-redshiftnasa-hubble-cosmological-redshiftThis is an authored directed relation from the source endpoint to the target endpoint.
Smooth FLRW expansion gives a locally linear distance–redshift relation; is the present value of , while peculiar velocities and higher-order cosmological terms matter beyond the local regime.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-hubble-lawnasa-hubble-constantnasa-hubble-cosmological-redshift