{"id":89621,"date":"2024-02-20T18:46:48","date_gmt":"2024-02-20T16:46:48","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=89621"},"modified":"2024-02-20T18:46:48","modified_gmt":"2024-02-20T16:46:48","slug":"lucrare-stiintifica-din-februarie-2024-o-stea-s-a-apropiat-de-sistemul-solar-si-a-modificat-orbita-si-climatul-pamantului-in-trecut","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/lucrare-stiintifica-din-februarie-2024-o-stea-s-a-apropiat-de-sistemul-solar-si-a-modificat-orbita-si-climatul-pamantului-in-trecut\/","title":{"rendered":"Lucrare \u015ftiin\u0163ific\u0103 din februarie 2024: &#8222;O stea s-a apropiat de sistemul solar \u0219i a modificat orbita \u015fi climatul P\u0103m\u00e2ntului \u00een trecut&#8221;"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/02\/sistem-solar-stea.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-89622\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/02\/sistem-solar-stea.jpg\" alt=\"\" width=\"360\" height=\"203\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/02\/sistem-solar-stea.jpg 360w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/02\/sistem-solar-stea-300x169.jpg 300w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a>Orbita P\u0103m\u00e2ntului a fost modificat\u0103 din cauza unei \u00eent\u00e2lniri \u00eent\u00e2mpl\u0103toare cu o stea care ar fi putut s\u0103 o afecteze suficient pentru a face ravagii asupra climei, au descoperit noi cercet\u0103ri. Cu aproximativ 56 de milioane de ani \u00een urm\u0103, la grani\u021ba dintre Paleocen \u0219i Eocen, temperatura P\u0103m\u00e2ntului a crescut cu p\u00e2n\u0103 la 8\u00b0 C. Aceasta a fost \u00eentotdeauna o enigm\u0103, dar Nathan Kaib, de la Institutul de \u0218tiin\u021be Planetare, \u0219i astrofizicianul Sean Raymond, de la Laboratorul de Astrofizic\u0103 de la Universitatea din Bordeaux, sugereaz\u0103 c\u0103 simul\u0103rile lor arat\u0103 trecerea unei stele prin sistemul solar, ce ar fi putut modifica suficient de mult orbitele planetare pentru a destabiliza P\u0103m\u00e2ntul de la cursul lui.<\/p>\n<p>\u00cenregistr\u0103rile geologice arat\u0103 c\u0103 schimb\u0103rile \u00een excentricitatea orbital\u0103 a P\u0103m\u00e2ntului \u00eenso\u021besc fluctua\u021biile climei P\u0103m\u00e2ntului. Din \u00eenregistr\u0103rile geologice, \u0219tim c\u0103 P\u0103m\u00e2ntul s-a \u00eenc\u0103lzit \u00eentre 5 \u0219i 8\u00b0 C \u00een perioada cunoscut\u0103 sub numele de &#8222;Maxim termic Paleocen-Eocen&#8221;. De asemenea, \u0219tim c\u0103 schimb\u0103rile drastice ale climei P\u0103m\u00e2ntului pot fi corelate cu modific\u0103rile modului \u00een care P\u0103m\u00e2ntul orbiteaz\u0103 \u00een jurul Soarelui.<\/p>\n<p>Sistemul solar este relativ stabil, dar orbitele pot fi modificate destul de u\u0219or. Orbita P\u0103m\u00e2ntului, de exemplu, este tras\u0103 \u00een mod regulat de planete gigantice, provoc\u00e2nd modific\u0103ri pe perioad\u0103 lung\u0103 \u00een excentricitatea sa orbital\u0103, \u00eenclina\u021bia axial\u0103 \u0219i precesia. Aceste schimb\u0103ri, care au loc pe parcursul a zeci de mii de ani, se numesc cicluri Milankovitch \u0219i le cunoa\u0219tem destul de bine.<\/p>\n<p>Kaib \u0219i Raymond au vrut s\u0103 \u0219tie dac\u0103 o stea c\u0103z\u0103toare ar putea avea un efect similar, chiar \u0219i de la o distan\u021b\u0103 considerabil\u0103. Munca lui s-a concentrat pe un singur eveniment cunoscut. Cu aproximativ 2,8 milioane de ani \u00een urm\u0103, o stea asem\u0103n\u0103toare Soarelui, numit\u0103 HD 7977 a trecut pe l\u00e2ng\u0103 sistemul solar, mai precis a trecut prin Norul lui Oort.<\/p>\n<p>Este posibil s\u0103 fi trecut la o distan\u021b\u0103 de aproximativ 31.000 de UA, ceea ce este echivalent cu de 31.000 de ori distan\u021ba dintre P\u0103m\u00e2nt \u0219i Soare, fiind prea departe pentru a fi avut un efect prea mare. Dar s-ar putea s\u0103 se fi apropiat la 4.000 UA. C\u00e2nd au efectuat simul\u0103rile, cercet\u0103torii au verificat c\u0103 distan\u021bele mai apropiate de cap\u0103tul inferior al intervalului au avut un anumit tip de influen\u021b\u0103 gravita\u021bional\u0103 asupra mi\u0219c\u0103rilor planetelor \u00een raport cu Soarele. Aceasta \u00eenseamn\u0103 c\u0103 este cu totul posibil ca o stea \u00een trecere s\u0103 fi afectat clima P\u0103m\u00e2ntului \u00een trecut \u0219i chiar s\u0103 fi jucat un rol \u00een maximul termic.<\/p>\n<p>Rezultatele cercet\u0103rii au fost publicate \u00een revista <a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/2041-8213\/ad24fb\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;The Astrophysical Journal Letters&#8221;<\/strong><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Orbita P\u0103m\u00e2ntului a fost modificat\u0103 din cauza unei \u00eent\u00e2lniri \u00eent\u00e2mpl\u0103toare cu o stea care ar fi putut s\u0103 o afecteze suficient pentru a face ravagii asupra climei, au descoperit noi cercet\u0103ri. Cu aproximativ 56 de milioane de ani \u00een urm\u0103, &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Lucrare \u015ftiin\u0163ific\u0103 din februarie 2024: &#8222;O stea s-a apropiat de sistemul solar \u0219i a modificat orbita \u015fi climatul P\u0103m\u00e2ntului \u00een trecut&#8221;\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/lucrare-stiintifica-din-februarie-2024-o-stea-s-a-apropiat-de-sistemul-solar-si-a-modificat-orbita-si-climatul-pamantului-in-trecut\/#more-89621\" aria-label=\"Cite\u0219te mai multe despre Lucrare \u015ftiin\u0163ific\u0103 din februarie 2024: &#8222;O stea s-a apropiat de sistemul solar \u0219i a modificat orbita \u015fi climatul P\u0103m\u00e2ntului \u00een trecut&#8221;\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":89622,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[5636,102,9915,2599,2526,4216,105,2364,3417,865,733,2358],"class_list":["post-89621","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-astrofizician","tag-astronomie","tag-bordeaux","tag-clima","tag-norul-lui-oort","tag-orbita","tag-pamant","tag-revista","tag-sistem-solar","tag-soare","tag-stea","tag-temperatura","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Lucrare \u015ftiin\u0163ific\u0103 din februarie 2024: &quot;O stea s-a apropiat de sistemul solar \u0219i a modificat orbita \u015fi climatul P\u0103m\u00e2ntului \u00een trecut&quot; - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/lucrare-stiintifica-din-februarie-2024-o-stea-s-a-apropiat-de-sistemul-solar-si-a-modificat-orbita-si-climatul-pamantului-in-trecut\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lucrare \u015ftiin\u0163ific\u0103 din februarie 2024: &quot;O stea s-a apropiat de sistemul solar \u0219i a modificat orbita \u015fi climatul P\u0103m\u00e2ntului \u00een trecut&quot;\" \/>\n<meta property=\"og:description\" content=\"Orbita P\u0103m\u00e2ntului a fost modificat\u0103 din cauza unei \u00eent\u00e2lniri \u00eent\u00e2mpl\u0103toare cu o stea care ar fi putut s\u0103 o afecteze suficient pentru a face ravagii asupra climei, au descoperit noi cercet\u0103ri. 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