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- Halton Arp (kategori 20th-century astronomers)Halton Christian "Chip" Arp (21 Maret 1927 – 28 Desember 2013) adalah seorang astronom asal Amerika Serikat. Ia dikenal karena karyanya yang diterbitkan...22 KB (1.492 kata) - 24 Juni 2024 11.14
- "Sunspot observation by the cooperation of amateur astronomers and researchers in Japan in early 20th century as early citizen science program". Education and...2 KB (108 kata) - 1 September 2023 11.15
- hlm. 168. ISBN 0-8027-1363-7. "History I: The Lowell Observatory in 20th century Astronomy". The Astronomical Society of the Pacific. 28 June 1994. Diarsipkan...121 KB (10.173 kata) - 22 Mei 2024 07.37
- (2003). Venus. Twenty-First Century Books. hlm. 12. ISBN 0-7613-2359-7. Dick, Steven (2001). Life on Other Worlds: The 20th-Century Extraterrestrial Life Debate...113 KB (11.308 kata) - 11 Agustus 2024 23.25