{"id":97154,"date":"2025-03-16T13:27:37","date_gmt":"2025-03-16T11:27:37","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=97154"},"modified":"2025-03-16T13:30:29","modified_gmt":"2025-03-16T11:30:29","slug":"doua-supernove-masive-aproape-ca-au-dus-la-disparitia-vietii-pe-pamant-in-urma-cu-sute-de-milioane-de-ani","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/doua-supernove-masive-aproape-ca-au-dus-la-disparitia-vietii-pe-pamant-in-urma-cu-sute-de-milioane-de-ani\/","title":{"rendered":"Dou\u0103 supernove masive aproape c\u0103 au dus la dispari\u0163ia vie\u0163ii pe P\u0103m\u00e2nt \u00een urm\u0103 cu sute de milioane de ani"},"content":{"rendered":"<figure id=\"attachment_97155\" aria-describedby=\"caption-attachment-97155\" style=\"width: 355px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/03\/supernova-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-97155\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/03\/supernova-1.jpg\" alt=\"\" width=\"365\" height=\"255\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/03\/supernova-1.jpg 524w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/03\/supernova-1-300x210.jpg 300w\" sizes=\"auto, (max-width: 365px) 100vw, 365px\" \/><\/a><figcaption id=\"caption-attachment-97155\" class=\"wp-caption-text\"><strong>Imagine<\/strong>: <a href=\"https:\/\/pixabay.com\/illustrations\/universe-supernova-space-galaxy-8076233\/\" target=\"_blank\" rel=\"noopener\"><strong>pixabay.com<\/strong><\/a> (Commons Creative &#8211; free)<\/figcaption><\/figure>\n<p>Stele care explodeaz\u0103 (<strong>supernove<\/strong>) \u00een spa\u021biul cosmic, aproape de sistemul nostru solar, ar fi declan\u0219at cel pu\u021bin dou\u0103 evenimente de extinc\u021bie \u00een mas\u0103 \u00een istoria P\u0103m\u00e2ntului &#8211; spune o nou\u0103 cercetare. O analiz\u0103 a frecven\u021bei exploziilor de supernove \u00een Calea Lactee, condus\u0103 de astrofizicianul <strong>Alexis Quintana<\/strong> de la Universitatea din Alicante din Spania, dezv\u0103luie o sincronizare perfect\u0103 cu extinc\u0163iile din Ordovicianul t\u00e2rziu \u0219i Devonianul t\u00e2rziu &#8211; evenimente devastatoare care au v\u0103zut distruse vaste zone de via\u021b\u0103 de pe Terra.<\/p>\n<p><em>&#8222;Exploziile de supernov\u0103 sunt unele dintre cele mai energice explozii din Univers. Dac\u0103 o stea masiv\u0103 ar exploda ca o supernov\u0103 aproape de P\u0103m\u00e2nt, rezultatele ar fi devastatoare pentru via\u021ba de pe P\u0103m\u00e2nt. Aceast\u0103 cercetare sugereaz\u0103 c\u0103 acest lucru s-ar fi putut \u00eent\u00e2mpla deja&#8221;<\/em>, explic\u0103 astrofizicianul <strong>Nick Wright<\/strong> de la Universitatea Keele din Marea Britanie. <em>&#8222;Am calculat rata supernovelor din apropierea P\u0103m\u00e2ntului \u0219i am constatat c\u0103 este \u00een concordan\u021b\u0103 cu rata evenimentelor de extinc\u021bie \u00een mas\u0103 de pe planeta noastr\u0103 care au fost legate de for\u021be externe, cum ar fi supernove&#8221;.<\/em><\/p>\n<p>Supernovele fac parte din ciclul normal de via\u021b\u0103 al stelelor care au de peste 8 ori masa propriului nostru Soare. Stelele mai mari tr\u0103iesc durate de via\u021b\u0103 relativ scurte, de milioane de ani, fa\u0163\u0103 de miliardele de ani pentru stele precum Soarele. Odat\u0103 ce r\u0103m\u00e2n f\u0103r\u0103 combustibil pentru a fuziona \u00een nucleele lor, aceste stele devin instabile \u0219i, \u00een cele din urm\u0103, explodeaz\u0103, pulveriz\u00e2nd spa\u021biul cu produsele metalice ale fuziunii lor \u00eentr-o explozie masiv\u0103 de lumin\u0103 \u0219i energie. Dac\u0103 o astfel de explozie ar avea loc suficient de aproape de P\u0103m\u00e2nt, rezultatele ar fi destul de devastatoare, ciocnind planeta noastr\u0103 cu radia\u021bii suficient de puternice pentru a epuiza stratul de ozon. Cre\u0219terea rezultat\u0103 a radia\u021biilor ultraviolete care ar putea ajunge apoi la suprafa\u021b\u0103 ar provoca daune ireparabile ecologiei planetei.<\/p>\n<p>Extinc\u021biile din Ordovicianul t\u00e2rziu \u0219i Devonianul t\u00e2rziu au avut loc \u00een urm\u0103 cu aproximativ 445 de milioane \u0219i, respectiv, 372 de milioane de ani, fiecare \u0219terg\u00e2nd majoritatea speciilor care tr\u0103iau pe P\u0103m\u00e2nt \u00een acele vremuri. Ambele au fost, de asemenea, corelate cu o epuizare semnificativ\u0103 a stratului de ozon, ceea ce a condus la specula\u021bii c\u0103 ar putea fi implicate supernove.<\/p>\n<p>Quintana \u0219i colegii s\u0103i au descoperit o leg\u0103tur\u0103 plauzibil\u0103 \u00eentre extinc\u021bii \u0219i supernove atunci c\u00e2nd au efectuat un recens\u0103m\u00e2nt de stele masive de tip OB pe o raz\u0103 de aproximativ 3.260 de ani-lumin\u0103 \u00een jurul Soarelui. Deoarece aceste stele duc o via\u021b\u0103 at\u00e2t de scurt\u0103, un recens\u0103m\u00e2nt al numerelor lor actuale le permite astronomilor s\u0103 calculeze ratele cu care se nasc \u0219i ratele cu care mor. \u00cen recens\u0103m\u00e2ntul lor, cercet\u0103torii au num\u0103rat 24.706 stele OB \u0219i au calculat o rat\u0103 a supernovei de 15 p\u00e2n\u0103 la 30 per milion de ani \u00een \u00eentreaga galaxie a Calei Lactee. Pentru ca o supernov\u0103 s\u0103 devasteze P\u0103m\u00e2ntul, trebuie s\u0103 fie relativ aproape de sistemul solar, a\u0219a c\u0103 echipa a folosit aceast\u0103 cifr\u0103 ca baz\u0103 pentru a calcula rata supernovelor OB pe o raz\u0103 de 65 de ani-lumin\u0103. Acest lucru a dat o rat\u0103 de 2,5 supernove OB aproape de P\u0103m\u00e2nt, timp de 1 miliard de ani &#8211; o cifr\u0103 care poate explica at\u00e2t evenimentele de extinc\u021bie ale Ordovicianului t\u00e2rziu, c\u00e2t \u0219i ale Devonianului t\u00e2rziu.<\/p>\n<p><strong>Sursa<\/strong>: studiul \u015ftiin\u0163ific <a href=\"https:\/\/arxiv.org\/abs\/2503.08286\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;A census of OB stars within 1 kpc and the star formation and core collapse supernova rates of the Milky Way&#8221; \/ arxiv.org<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Stele care explodeaz\u0103 (supernove) \u00een spa\u021biul cosmic, aproape de sistemul nostru solar, ar fi declan\u0219at cel pu\u021bin dou\u0103 evenimente de extinc\u021bie \u00een mas\u0103 \u00een istoria P\u0103m\u00e2ntului &#8211; spune o nou\u0103 cercetare. O analiz\u0103 a frecven\u021bei exploziilor de supernove \u00een Calea &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Dou\u0103 supernove masive aproape c\u0103 au dus la dispari\u0163ia vie\u0163ii pe P\u0103m\u00e2nt \u00een urm\u0103 cu sute de milioane de ani\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/doua-supernove-masive-aproape-ca-au-dus-la-disparitia-vietii-pe-pamant-in-urma-cu-sute-de-milioane-de-ani\/#more-97154\" aria-label=\"Cite\u0219te mai multe despre Dou\u0103 supernove masive aproape c\u0103 au dus la dispari\u0163ia vie\u0163ii pe P\u0103m\u00e2nt \u00een urm\u0103 cu sute de milioane de ani\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":97155,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[5636,102,1405,19819,66,7997,433,952,392,19818,3725,105,3204,3417,865,318,3175,2317,1954,1087,2250,366],"class_list":["post-97154","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-astrofizician","tag-astronomie","tag-calea-lactee","tag-devonian","tag-energie","tag-fuziune","tag-galaxie","tag-lumina","tag-marea-britanie","tag-ordovician","tag-ozon","tag-pamant","tag-radiatii","tag-sistem-solar","tag-soare","tag-spania","tag-stele","tag-supernova","tag-ultraviolete","tag-univers","tag-universitate","tag-viata","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Dou\u0103 supernove masive aproape c\u0103 au dus la dispari\u0163ia vie\u0163ii pe P\u0103m\u00e2nt \u00een urm\u0103 cu sute de milioane de ani - 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\/doua-supernove-masive-aproape-ca-au-dus-la-disparitia-vietii-pe-pamant-in-urma-cu-sute-de-milioane-de-ani\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dou\u0103 supernove masive aproape c\u0103 au dus la dispari\u0163ia vie\u0163ii pe P\u0103m\u00e2nt \u00een urm\u0103 cu sute de milioane de ani\" \/>\n<meta property=\"og:description\" content=\"Stele care explodeaz\u0103 (supernove) \u00een spa\u021biul cosmic, aproape de sistemul nostru solar, ar fi declan\u0219at cel pu\u021bin dou\u0103 evenimente de extinc\u021bie \u00een mas\u0103 \u00een istoria P\u0103m\u00e2ntului &#8211; spune o nou\u0103 cercetare. 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O analiz\u0103 a frecven\u021bei exploziilor de supernove \u00een Calea ... 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