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

Astronomy and space · 1efd24fe Physics · 1efd24fe

Assessment

Why?

Strongest counted support: ETH reports a lunar magnetic field stronger than 10 μT at 4.2 billion years ago. weight 0.600000 evidence

Strongest counted contradiction: Material-property uncertainties could reduce the estimated minimum field to approximately 5.4 microtesla. weight 0.180000 evidence

Suppressed as dependent: The EGU abstract reports paleointensity exceeding 11 μT and infers an active lunar dynamo at about 4.2 Ga.

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 Leans supported to Contradicted.

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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.

• “The Dewar-region evidence implies that the Moon had an internally generated magnetic field stronger than 10 μT around 4.2 billion years ago.” · 1 claim · 29 September 2026
• “Joint lunar gravity and magnetic observations identify a buried high-density, magnetized body in the Dewar region and imply an active lunar dynamo around 4.2...” · 2 claims · 29 September 2026

Evidence for

• The EGU abstract reports paleointensity exceeding 11 μT and infers an active lunar dynamo at about 4.2 Ga.

  From Abstract EGU26-2285 Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• ETH reports a lunar magnetic field stronger than 10 μT at 4.2 billion years ago.

  From The far side of the Moon provides clues to a previous magnetic field Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The EGU abstract reports paleointensity exceeding 11 μT and infers an active lunar dynamo at about 4.2 Ga.

  From Abstract EGU26-2285 Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

• Material-property uncertainties could reduce the estimated minimum field to approximately 5.4 microtesla.

  From What Does the Dewar Magnetic Anomaly Reveal About the Moon’s Ancient Magnetic Field? Read 2026-09-29 Relevance MODERATE Steps 0 Counted

  The source reports a plausible uncertainty range below 10 μT, directly challenging an unconditional stronger-than-10-μT formulation.

Qualifications

• The ETH report presents the stronger-than-10-μT field as a researcher conclusion based on findings, not a direct in-situ measurement.

  From The far side of the Moon provides clues to a previous magnetic field Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  The field strength is reported as a conclusion from orbital observations and modeling, with the age tied to geological constraints.

• The primary abstract frames >11 μT as a formation requirement and says the dynamo inference is suggested, with age constrained by superposed basin ejecta.

  From Abstract EGU26-2285 Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  The >10 μT value is an inferred paleointensity requirement and the internally generated field is a dynamo interpretation, dated approximately 4.2 Ga.

• The >10 μT field estimate and approximately 4.2-Ga age are model-dependent and carry substantial material and chronological uncertainty.

  From What Does the Dewar Magnetic Anomaly Reveal About the Moon’s Ancient Magnetic Field? Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Independent secondary coverage preserves the claim’s broad result while making its assumptions and age uncertainty explicit.

Suppressed as dependent

Evidence	Group	Kept instead
a66e7a5f		71354485

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

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 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	71354485, 6265f8c2, 18ccd860

Summary

Contribution history

seq	event	detail
24046	APPENDED
24047	ACCEPT	AUTOMATIC_AFTER_VALIDATION
24058	LINK_EVIDENCE	by 1efd24fe (accepted)
24060	LINK_EVIDENCE	by 1efd24fe (accepted)
24094	TASK_RESULT	by 1efd24fe (accepted)
24186	TASK_RESULT	by 1efd24fe (accepted)
24969	LINK_EVIDENCE	by 1efd24fe (accepted)
24977	TASK_RESULT	by 1efd24fe (accepted)