# Does any observation of 'Oumuamua require a non-natural explanation? · 1I/'Oumuamua > Three answers have been proposed. No. Every property has at least one natural explanation consistent with the data, though none is confirmed. leads, with… Source: https://mysteriesdept.com/mysteries/oumuamua/questions/QST0CSKC0CJ74DR/does-any-observation-of-oumuamua-require-a-non-natural Publisher: Mysteries Department Licence: CC BY 4.0 (credit Mysteries Department and link the page) Updated: 2026-10-26T11:58:22+00:00 --- **0** # Does any observation of 'Oumuamua require a non-natural explanation? Asked 26 Oct 2026 by [**apollo** ](https://mysteriesdept.com/u/apollo)·3 answers·0·0 following **Answered: No. Every property has at least one natural explanation consistent with the data, though none is confirmed.** Passed its tests and review. ## Where it stands Three answers have been proposed. No. Every property has at least one natural explanation consistent with the data, though none is confirmed. leads, with evidence 3 for, 1 against: supported by its tests. Two are still possible. ## Why it matters The question has been argued in public since 2018 and colours how every later interstellar object is reported⁠[[1]](https://mysteriesdept.com/sources/SRC0CSKB6R811G8/could-solar-radiation-pressure-explain-oumuamuas-peculiar)⁠[[2]](https://mysteriesdept.com/sources/SRC0CSKBKY45X1E/on-the-possibility-of-an-artificial-origin-for-oumuamua). It is answerable on the evidence: each anomaly either has a natural reading consistent with the data or it does not⁠[[3]](https://mysteriesdept.com/sources/SRC0CSKB702723E/the-natural-history-of-oumuamua). ## Answers 3 [**No. Every property has at least one natural explanation consistent with the data, though none is confirmed.** ](https://mysteriesdept.com/mysteries/oumuamua/answers/ANS0CSKCKNR630W/no-every-property-has-at-least-one-natural-explanation) Supported by its tests Evidence: 3 for, 1 against Most likely [**None of these.** ](https://mysteriesdept.com/mysteries/oumuamua/answers/ANS0CSKCPBP7YSG/none-of-these) Failed a test; not refuted outright Evidence: none yet Disputed [**Yes, or at least the anomalies together favour an artificial object, such as a lightsail.** ](https://mysteriesdept.com/mysteries/oumuamua/answers/ANS0CSKCMWT3KCY/yes-or-at-least-the-anomalies-together-favour-an-artificial) Failed a test; not refuted outright Evidence: 2 for, 3 against Disputed ## History 1. 2018[Enriquez et al.: radio searches at Green Bank, the Allen Telescope Array and the MWA found no signals.](https://mysteriesdept.com/sources/SRC0CSKB51J2Z8E/breakthrough-listen-observations-of-1i-oumuamua-with-the-gbt)For: No. Every property has at least one natural explanation consistent with the data, though none is confirmed. 1. 2018[Bialy & Loeb: radiation pressure on a thin sheet fits the push.](https://mysteriesdept.com/sources/SRC0CSKB6R811G8/could-solar-radiation-pressure-explain-oumuamuas-peculiar)For: Yes, or at least the anomalies together favour an artificial object, such as a lightsail. 1. 2019[The 'Oumuamua ISSI Team et al. puts forward: no. Every property has at least one natural explanation consistent with the data, though none is confirmed.](https://mysteriesdept.com/sources/SRC0CSKB702723E/the-natural-history-of-oumuamua) 1. 2019[The 'Oumuamua ISSI Team et al.: the ISSI team found every observation consistent with a purely natural origin.](https://mysteriesdept.com/sources/SRC0CSKB702723E/the-natural-history-of-oumuamua)For: No. Every property has at least one natural explanation consistent with the data, though none is confirmed. 1. 2021[Levine et al.: each natural composition reading has quantitative shortcomings, and none is accepted.](https://mysteriesdept.com/sources/SRC0CSKBJYW06A8/constraints-on-the-occurrence-of-oumuamua-like-objects)Against: No. Every property has at least one natural explanation consistent with the data, though none is confirmed. 1. 2021[Curran: a sail would need about half a billion years to arrive from its likeliest origin.](https://mysteriesdept.com/sources/SRC0CSKBKPA2Q52/oumuamua-as-a-light-sail-evidence-against-artificial-origin)Against: Yes, or at least the anomalies together favour an artificial object, such as a lightsail. 1. 2022[Loeb puts forward: yes, or at least the anomalies together favour an artificial object, such as a lightsail.](https://mysteriesdept.com/sources/SRC0CSKBKY45X1E/on-the-possibility-of-an-artificial-origin-for-oumuamua) 1. 2022[Zhou et al.: the light curve and lateral motion are unlikely for a sail.](https://mysteriesdept.com/sources/SRC0CSKBAN832WG/observable-tests-for-the-light-sail-scenario-of-interstellar)Against: Yes, or at least the anomalies together favour an artificial object, such as a lightsail. 1. 2022[Loeb: all natural readings invoke an object of a type never seen before.](https://mysteriesdept.com/sources/SRC0CSKBKY45X1E/on-the-possibility-of-an-artificial-origin-for-oumuamua)For: Yes, or at least the anomalies together favour an artificial object, such as a lightsail. 1. 2023[Seligman et al.: dark comets show that accelerations without visible activity occur naturally.](https://mysteriesdept.com/sources/SRC0CSKB8YJ3FHB/dark-comets-unexpectedly-large-nongravitational)For: No. Every property has at least one natural explanation consistent with the data, though none is confirmed. 1. 2026[Hui et al.: the same group's claims for 3I/ATLAS, such as a nucleus above 5 km, were not borne out by Hubble.](https://mysteriesdept.com/sources/SRC0CSKBDTT2X79/nucleus-and-postperihelion-activity-of-interstellar-object)Against: Yes, or at least the anomalies together favour an artificial object, such as a lightsail. 1. 26 Oct 2026Asked on this site ## Discussion 0 [Add to the discussion](https://mysteriesdept.com/signin?next=/mysteries/oumuamua/questions/QST0CSKC0CJ74DR/does-any-observation-of-oumuamua-require-a-non-natural%23discussion) Help with this question [ **Propose an answer** Something the evidence could support or rule out ] [ **Propose an answer** Something the evidence could support or rule out ](https://mysteriesdept.com/signin?next=/mysteries/oumuamua/questions/QST0CSKC0CJ74DR/does-any-observation-of-oumuamua-require-a-non-natural%23add-answer) [ **Add evidence** A result for or against an answer ] [ **Add evidence** A result for or against an answer ](https://mysteriesdept.com/signin?next=/mysteries/oumuamua/questions/QST0CSKC0CJ74DR/does-any-observation-of-oumuamua-require-a-non-natural%23add-evidence) [ **Ask a sub-question** A smaller question that would help settle this one ] [ **Ask a sub-question** A smaller question that would help settle this one ](https://mysteriesdept.com/signin?next=/mysteries/oumuamua/questions/QST0CSKC0CJ74DR/does-any-observation-of-oumuamua-require-a-non-natural%23add-question) [ **Add a source** A paper, archive record or image ] [ **Add a source** A paper, archive record or image ](https://mysteriesdept.com/signin?next=/mysteries/oumuamua/questions/QST0CSKC0CJ74DR/does-any-observation-of-oumuamua-require-a-non-natural%23add-source) Where it fits 1I/'Oumuamua **Does any observation of 'Oumuamua require a non-natural explanation?** Key question · you're here [ Ask a question under this one ]