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interstellar object detected passing through the Solar System. Formally designated 1I/2017 U1, it was discovered by Robert Weryk using the Pan-STARRS telescope
July–September 2020 in science
planet. 17 August Astronomers report that the interstellar object ʻOumuamua (1I/2017 U1) is not likely to be composed of frozen hydrogen which had been proposed
January–March 2023 in science
Seligman, Darryl Z. (22 March 2023). "Acceleration of 1I/'Oumuamua from radiolytically produced H2 in H2O ice". Nature. 615 (7953): 610–613. arXiv:2303.13698
Applied and Environmental Microbiology. 35 (1): 1–5. Bibcode:1978ApEnM..35....1I. doi:10.1128/aem.35.1.1-5.1978. PMC 242768. PMID 623455. Dose, K.; Bieger-Dose
April–June 2020 in science
Laughlin, Gregory (9 June 2020). "Evidence that 1I/2017 U1 ('Oumuamua) was Composed of Molecular Hydrogen Ice". The Astrophysical Journal. 896 (1): L8. arXiv:2005