Claim

UBC reported that CHIME made a standalone detection of neutral-hydrogen emission from roughly five billion years ago using 94 nights of 2019 observations, demonstrating a potential independent intensity-mapping route for studying cosmic expansion.

Type OBSERVATIONAL · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 18950

33 words; atomic claims are usually under 25

Referenced 92 times: checked 1, looked up by assistants 0, viewed 70, shared 21. A count of attention, not evidence.

Topics

Astronomy and space · 1efd24fe Physics · 1efd24fe

Assessment

Leans supported

Score: 0.7790 under ledger-default@0.3.0 at snapshot 27745

2 of 4 review checks done · 0 counted · 2 by the author only

2 independent evidence lineages · review checks 0 of 4 · stability MEDIUM

Main unresolved issue: 4 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:275e3c77-9a65-80b4-922c-68b33ffde7da

Not yet independently audited.Evidence points both ways.A quoted passage from news.ubc.ca was not found on the page when Galedra fetched it.

Why?

Strongest counted support: UBC’s report describes CHIME’s standalone hydrogen detection, approximate epoch, neutral fraction, and 94-night 2019 dataset. weight 1.800000 evidence

Strongest counted contradiction: Independent coverage dates the CHIME signal to seven to nine billion years ago, conflicting with a literal roughly five-billion-years-ago timing. weight 0.540000 evidence

Suppressed as dependent: The passage directly reports CHIME’s standalone detection, approximate epoch, neutral fraction, and 94-night 2019 observations.

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

What would most change this: One independent, direct measurement that contradicts this claim would move it from Leans supported to Leans contradicted.

Hide calculation

0.7790 under ledger-default@0.3.0 at snapshot 27745 · state Leans supported · Review checks: 0 of 4 · stability MEDIUM · 4 sources, 2 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:2eaa52922a3194443eb7201dd1afb8ef490035a423c12be11ed1905ac64846aa

Last changed at entry seq 25858; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
1cb08f90 contradict	relevance MODERATE 0.6 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	0.540000	0.540000
6ca9b00c support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (dependent strongest only, kept e17adf4c)
e17adf4c support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	1.800000
7384edbc qualify	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (non directional)

prior 0.50 → log-odds 0.000000 + 1.260000 (the counted weights) = 1.260000 → probability 0.7790

Under neighbouring settings of the same model: 0.7072 to 0.8373, a spread of 0.1301.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

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.

“UBC reported that CHIME made a standalone detection of neutral-hydrogen emission from roughly five billion years ago using 94 nights of 2019 observations,...” · 1 claim · 29 September 2026

Evidence for

UBC’s report describes CHIME’s standalone hydrogen detection, approximate epoch, neutral fraction, and 94-night 2019 dataset.

From Canadian telescope directly maps earliest glow of hydrogen, opening a new window on the universe Read 2026-09-29 Relevance DIRECT Steps 0 Counted
The passage directly reports CHIME’s standalone detection, approximate epoch, neutral fraction, and 94-night 2019 observations.

From Canadian telescope directly maps earliest glow of hydrogen, opening a new window on the universe Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

Independent coverage dates the CHIME signal to seven to nine billion years ago, conflicting with a literal roughly five-billion-years-ago timing.

From Indian scientists spot hydrogen from 8 billion years ago. It could help decode dark energy Read 2026-09-29 Relevance MODERATE Steps 0 Counted

Qualifications

The result demonstrates a detection capability that enables future expansion studies, rather than measuring cosmic expansion itself.

From Canadian telescope directly maps earliest glow of hydrogen, opening a new window on the universe Read 2026-09-29 Relevance DIRECT Steps 0 Counted

The claim’s “potential independent route” wording is appropriate, but the result should not be read as a completed expansion measurement.

Suppressed as dependent

Evidence	Group	Kept instead
12f6ed01		e17adf4c

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: 0 of 4

3 checks by this claim's own author. No independent review yet. 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	no

Summary

Leans supported. The main support is: UBC’s report describes CHIME’s standalone hydrogen detection, approximate epoch, neutral fraction, and 94-night 2019 dataset. 2c655008

Against that, contradiction: Independent coverage dates the CHIME signal to seven to nine billion years ago, conflicting with a literal roughly five-billion-years-ago timing. fd5918da

1 further item repeats the same origin and is not independent evidence. 12f6ed01

Qualifier: The result demonstrates a detection capability that enables future expansion studies, rather than measuring cosmic expansion itself. b9904247

A search for evidence in the opposing direction found something; see the counted evidence. 5589dee1

Review checks: 0 of 4. coverage:275e3c77-9a65-80b4-922c-68b33ffde7da

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
18950	APPENDED
18951	ACCEPT	AUTOMATIC_AFTER_VALIDATION
18956	LINK_EVIDENCE	by 1efd24fe (accepted)
18958	TASK_RESULT	by 1efd24fe (accepted)
25055	TASK_RESULT	by 1efd24fe (accepted)
25857	TASK_RESULT	by 1efd24fe (accepted)

Score trace

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  "claim": "275e3c77-9a65-80b4-922c-68b33ffde7da",
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  "prior": "0.50",
  "variants": {
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    "permissive": "0.8373",
    "conservative": "0.7072"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": true,
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  "claim_type": "OBSERVATIONAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
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  "snapshot_seq": 25858,
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  "support_groups": 1,
  "model_dependent": false,
  "review_coverage": "0.00",
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  "review_checklist": {
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    "opposing_search_done": {
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}