Proof Engine Verification: Dark energy constitutes more than 68% of the universe's total energy density according to the Planck 2018 legacy release.

Automated fact-verification of the claim: "Dark energy constitutes more than 68% of the universe's total energy density according to the Planck 2018 legacy release." Verdict: PROVED (with unverified citations) Key Findings The Planck 2018 legacy release reports a dark energy density parameter of ΩΛ = 0.6853 ± 0.0074 in the base-ΛCDM model, corresponding to 68.53% of the universe's total energy density. This value exceeds the 68% threshold stated in the claim: 0.6853 > 0.68. An independent derivation from the matter density parameter (Ωm = 0.315 ± 0.007) yields ΩΛ = 1 − Ωm = 0.685, consistent with the directly reported value (relative difference < 0.05%). No revisions, errata, or retractions affecting this value have been issued. Files proof.py — Re-runnable Python verification script proof.md — Structured proof report proof_audit.md — Full verification audit trail proof_narrative.md — Plain-language summary proof.json — Machine-readable structured data Generated by Proof Engine v0.10.0.