Supernova teams: evidence that cosmic expansion is accelerating

What changed

Two independent supernova programs found distance–redshift evidence consistent with an accelerating cosmic expansion.

Scientific scope

Two independent supernova programs found distance–redshift evidence consistent with an accelerating cosmic expansion. Scope limitation: One package groups the 1998 Riess and 1999 Perlmutter papers so the same milestone is not counted twice. Inference depends on calibration and cosmological assumptions.

Evidence

Assessment uses the catalogue-linked source evidence for the stated contribution. One package groups the 1998 Riess and 1999 Perlmutter papers so the same milestone is not counted twice. Inference depends on calibration and cosmological assumptions.

Contributors

• The research collaboration listed in the linked record and source byline · SCIENCE: Collective scoped contribution. The complete recorded byline remains in the research record; this label does not collapse people into one individual.

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant — deposited bibliography
• Measurements of Ω and Λ from 42 High‐Redshift Supernovae
• Measurements of Ω and Λ from 42 High‐Redshift Supernovae — deposited bibliography

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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