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Oumuamuas passing through molecular clouds

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Susanne Pfalzner, Melvyn B. Davies, Giorgi Kokaia, Michele Bannister

Astrophysics of Galaxies · Submitted 18 Sep 2020

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We find that the ISOs pass amazingly often through molecular clouds.

how it is stated · asserted 1.00 read the record →

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arXiv ID2009.08773 (version 1)
Pith ID5XFATNJL, Pith's permanent record of this paper and its review
CitationGiorgi Kokaia, Melvyn B. Davies, Michele Bannister, Susanne Pfalzner. "Oumuamuas passing through molecular clouds." arXiv:2009.08773 (2020). https://pith.science/paper/5XFATNJL
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The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 8,754 input tokens.

What the abstract itself states, as probabilities: claims first 0.46 · states limitation 0.72 · human participants 0.01 · controlled comparison 0.04 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.09 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

The detections of 1I/Oumuamua and 2I/Borisov within just two years demonstrate impressively that interstellar objects (ISOs) must be common in the Milky Way. Once released from their parent system, these ISOs travel for Gyr through interstellar space. While often imagined as empty, interstellar space contains gas and dust most prominent in the form of molecular clouds. Performing numerical simulations, we test how often ISOs cross such molecular clouds. We find that the ISOs pass amazingly often through molecular clouds. In the solar neighbourhood, ISOs typically spend 0.1-0.2% of their journey inside molecular clouds, for relative slow ISOs ($<$ 5 km/s) this can increase to 1-2%, equivalent to 10 - 20 Myr per Gyr. Thus the dynamically youngest ISOs spend the longest time in molecular clouds. In other words, molecular clouds must mainly contain relatively young ISOs ($<$ 1-2 Gyr). Thus the half-life of the seeding process by ISOs is substantially shorter than a stellar lifetime. The actual amount of time spent in MCs decreases with distance to the Galactic Centre. We find that ISOs pass so often through MCs that backtracing their path to find their parent star beyond 250 Myr seems beyond the point. Besides, we give a first estimate of the ISO density depending on the galactic centre distance based on the stellar distribution.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 The detections of 1I/Oumuamua and 2I/Borisov within just two years demonstrate impressively that interstellar objects (ISOs) must be common in the Milky Way. background 0.99 0.08 0.07 asserted 1.00
s1 Once released from their parent system, these ISOs travel for Gyr through interstellar space. background 1.00 0.07 0.02 asserted 1.00
s2 While often imagined as empty, interstellar space contains gas and dust most prominent in the form of molecular clouds. background 1.00 0.04 0.02 asserted 0.99
s3 Performing numerical simulations, we test how often ISOs cross such molecular clouds. method 0.89 0.92 0.03 asserted 0.53
s4 We find that the ISOs pass amazingly often through molecular clouds. result 1.00 0.96 0.48 asserted 1.00
s5 In the solar neighbourhood, ISOs typically spend 0.1-0.2% of their journey inside molecular clouds, for relative slow ISOs ($<$ 5 km/s) this can increase to 1-2%, equivalent to 10 - 20 Myr per Gyr. result 1.00 0.92 0.20 asserted 1.00
s6 Thus the dynamically youngest ISOs spend the longest time in molecular clouds. result 0.54 0.81 0.10 asserted 1.00
s7 In other words, molecular clouds must mainly contain relatively young ISOs ($<$ 1-2 Gyr). interpretation 0.98 0.82 0.33 asserted 0.98
s8 Thus the half-life of the seeding process by ISOs is substantially shorter than a stellar lifetime. interpretation 0.94 0.70 0.20 asserted 0.99
s9 The actual amount of time spent in MCs decreases with distance to the Galactic Centre. result 1.00 0.82 0.06 asserted 1.00
s10 We find that ISOs pass so often through MCs that backtracing their path to find their parent star beyond 250 Myr seems beyond the point. result 0.70 0.92 0.21 asserted 0.93
s11 Besides, we give a first estimate of the ISO density depending on the galactic centre distance based on the stellar distribution. contribution 0.54 0.92 0.05 asserted 0.92

What kind of paper the classifier reports this is: simulation study 1.00 · evidence from simulation or computation 1.00.

What was examined, and what was not

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not examined
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  • figures and tables
  • references and citing sentences
  • relations to other papers
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  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

The detections of 1I/Oumuamua and 2I/Borisov within just two years demonstrate impressively that interstellar objects (ISOs) must be common in the Milky Way. Once released from their parent system, these ISOs travel for Gyr through interstellar space. While often imagined as empty, interstellar space contains gas and dust most prominent in the form of molecular clouds. Performing numerical simulations, we test how often ISOs cross such molecular clouds. We find that the ISOs pass amazingly often through molecular clouds. In the solar neighbourhood, ISOs typically spend 0.1-0.2% of their journey inside molecular clouds, for relative slow ISOs ($<$ 5 km/s) this can increase to 1-2%, equivalent to 10 - 20 Myr per Gyr. Thus the dynamically youngest ISOs spend the longest time in molecular clouds. In other words, molecular clouds must mainly contain relatively young ISOs ($<$ 1-2 Gyr). Thus the half-life of the seeding process by ISOs is substantially shorter than a stellar lifetime. The actual amount of time spent in MCs decreases with distance to the Galactic Centre. We find that ISOs pass so often through MCs that backtracing their path to find their parent star beyond 250 Myr seems beyond the point. Besides, we give a first estimate of the ISO density depending on the galactic centre distance based on the stellar distribution.

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References
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2 arXiv papers cite this in 2 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

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