trustme.bro/r/…
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the claim
Comoving and proper distances diverge in an expanding universe
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

Comoving distance remains constant with cosmic expansion for objects sharing the Hubble flow, whereas proper distance scales directly with the scale factor, making their divergence a foundational principle of standard cosmology.

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The analysis

The claim is a standard definition in physical cosmology regarding how coordinate distances and physical proper distances behave as space expands. While textbook common knowledge in astronomy, papers such as [3] and [10] touch upon the definitions and dynamics of comoving and proper distances in expanding spacetimes.

Everything we examined (12) — 11 independent sources
We also searched for evidence AGAINST this claim, not only for it.
  1. Practical Guide to Measuring Wetland Carbon Pools and Fluxes.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. Model-independent cosmological inference after the DESI DR2 data with improved inverse distance ladderpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Cosmology and Fundamental Physics with the Euclid Satellite.peer-reviewedsame source L3no side takennot shown: read and judged not to bear on this claim
  4. Fundamental Aspects of the Expansion of the Universe and Cosmic Horizonspeer-reviewedsupportsnot shown: read and graded, but this claim needs no citation to stand
  5. Cosmology and fundamental physics with the Euclid satellite.peer-reviewedsame source L3no side takennot shown: read and judged not to bear on this claim
  6. Expanding covariant cosmography of the local universe: incorporating the snap and axial symmetrypeer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Evolution of clustering in cosmological models with time-varying dark energypeer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. Testing general relativity in cosmology.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Cosmological distance forecasts for the CSST Galaxy Survey using BAO peakspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. A possible role for the merger of clusters/voids in the cosmological expansionpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. EXPLORING THE INTERCONNECTEDNESS OF COSMOLOGICAL PARAMETERS AND OBSERVATIONS: INSIGHTS INTO THE PROPERTIES AND EVOLUTION OF THE UNIVERSEpeer-reviewedsupportsnot shown: read and graded, but this claim needs no citation to stand
  12. Primordial black holes and their gravitational-wave signatures.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked06 Aug 2026
judged → COMMON KNOWLEDGE · 006 Aug 2026
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