Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Biology · 1efd24fe Astronomy and space · 1efd24fe

Assessment

Why?

Strongest counted support: The abstract states that metabolism was fueled by abiotic H2 from simulated mineral-water reactions. weight 1.800000 evidence

Suppressed as dependent: The quoted passage directly states that M. okinawensis carbon and energy metabolism was entirely fueled by abiotic H2 derived from simulated mineral-water reactions.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Unresolved.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “A 2026 Science Advances experiment tested Methanothermococcus okinawensis in simulated Enceladus-like ocean chemistry, reporting growth to pH 11 and carbon...” · 3 claims · 29 September 2026

Evidence for

• The abstract states that metabolism was fueled by abiotic H2 from simulated mineral-water reactions.

  From Enceladus-like geochemistry fuels methanogenesis under extreme CO2 limitation Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The quoted passage directly states that M. okinawensis carbon and energy metabolism was entirely fueled by abiotic H2 derived from simulated mineral-water reactions.

  From Enceladus-like geochemistry fuels methanogenesis under extreme CO2 limitation Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  The excerpt directly states the organism, metabolic fuel, and source of the H2.

Evidence against

None.

Qualifications

• The metabolism result is a 48-hour laboratory observation for one methanogen strain in simulated Enceladus chemistry, not evidence from the moon itself or long-term persistence.

  From Enceladus-like geochemistry fuels methanogenesis under extreme CO2 limitation Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Adds incubation duration, laboratory/simulation boundary, strain scope, alkaline range, and distinction between observed metabolism and extraterrestrial life.

Suppressed as dependent

Evidence	Group	Kept instead
a98f36e7		6b0850ac

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

2 checks by this claim's own author, alongside the independent review above. 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	6b0850ac, 3633eca1, 5a86bdc0

Summary

Contribution history

seq	event	detail
23966	APPENDED
23967	ACCEPT	AUTOMATIC_AFTER_VALIDATION
23980	LINK_EVIDENCE	by 1efd24fe (accepted)
24638	TASK_RESULT	by 1efd24fe (accepted)
25713	TASK_RESULT	by 1efd24fe (accepted)

Score trace

{
  "claim": "afee8f08-1aae-85f0-9e16-1e9cdf24f381",
  "links": [
    {
      "link": "37dde531-7496-8f2c-b521-00746b0850ac",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "58510a2b-72ce-823f-9075-2beb0df303ea",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "kept": "37dde531-7496-8f2c-b521-00746b0850ac",
      "link": "9b506ed1-c7e5-81b9-92c6-b1f83633eca1",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "4edf2832-b7ef-83e1-bf38-15ffa98f36e7",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "fb5fbb50-66d7-8652-a59c-f01b5a86bdc0",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "45e14f57-56df-8d2e-bccf-a5cd6a6a49db",
      "direction": "QUALIFY",
      "magnitude": "2.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.1331",
    "permissive": "0.9121",
    "conservative": "0.7790"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "MEDIUM",
  "claim_type": "OBSERVATIONAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.8581",
  "provisional": true,
  "evidence_sum": "1.800000",
  "snapshot_seq": 25714,
  "prior_log_odds": "0.000000",
  "support_groups": 1,
  "model_dependent": false,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
      "by": [],
      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
        "37dde531-7496-8f2c-b521-00746b0850ac",
        "9b506ed1-c7e5-81b9-92c6-b1f83633eca1",
        "fb5fbb50-66d7-8652-a59c-f01b5a86bdc0"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "1.800000",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}