# Type Ia Supernova **Domain:** Astrophysics / Cosmology **Doc Type:** Scientific Concept Node A **Type Ia supernova** is a thermonuclear stellar explosion whose light-curve regularities allow calibrated distance estimation. Collections of these events are central to measurements of cosmic expansion and dark energy. ## STEVE Context [[Steve - A Hierarchical Bayesian Model for Supernova Cosmology]] jointly models Type Ia populations, cosmological parameters, host-galaxy information, selection effects, and uncertainty. ## Routes [[articles/STEVE|STEVE]] · [[articles/The Hawking Continuity|The Hawking Continuity]] ## Source - [NASA — Type Ia supernovae](https://science.nasa.gov/universe/supernovae/)