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Há 2 dias · Jan Hendrik Oort is recognized as one of the greatest astronomers of the 20 th century. His 225 publications that appeared during 1922-1992 are analyzed. Most of the papers of the scientist (N= 170) are non-collaborative.
- Susanta Koley, B K Sen
- 2018
Há 13 horas · Dutchman and radio astronomy pioneer Jan Oort also hypothesized the existence of dark matter in 1932. [25] [27] [28] Oort was studying stellar motions in the local galactic neighborhood and found the mass in the galactic plane must be greater than what was observed, but this measurement was later determined to be erroneous. [29]
Há 1 dia · The Dutch astronomer Jan H. Oort first interpreted this effect in terms of galactic rotation motions, employing the radial velocities and proper motions of stars.
Há 4 dias · September 30, 2021 - Comet Bernardinelli-Bernstein is one of the largest comets ever seen, measuring a colossal 150km wide. The newly discovered comet is set to fly through our inner solar system in 10 years.
Há 13 horas · We hebben 'm volbracht, de 'tocht der tochten' oftewel de Elfstedentocht. En wat was het mooi! De elf historische steden van Friesland zijn alle een bezoek meer dan waard.
Há 1 dia · Innan nokkurra áratuga urðu þær að lokum til þess, að Hollendingurinn J.H. Oort (1900-1992) setti fram hina vel þekktu tilgátu sína, að svo til allar halastjörnur með langan (eða óendanlegan) umferðartíma eigi uppruna sinn í kúlulaga hjúpi umhverfis sólkerfið, hjúpi sem nú er við hann kenndur og kallaður Oortsskýið.
Há 4 dias · Urban transportation significantly contributes to greenhouse gas emissions, with CO 2 emissions from urban travelers varying across different regions. Identifying the determinants of residents’ travel-related CO 2 emissions (TCE) from a spatial perspective is significant for formulating effective carbon reduction strategies.
