{"id":91115,"date":"2024-06-12T16:13:15","date_gmt":"2024-06-12T13:13:15","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=91115"},"modified":"2024-06-12T16:13:15","modified_gmt":"2024-06-12T13:13:15","slug":"cercetatorii-au-descoperit-acum-2-milioane-de-ani-pamantul-a-inghetat-de-tot-si-nu-mai-era-protejat-de-soare-de-ce","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/cercetatorii-au-descoperit-acum-2-milioane-de-ani-pamantul-a-inghetat-de-tot-si-nu-mai-era-protejat-de-soare-de-ce\/","title":{"rendered":"Cercet\u0103torii au descoperit: acum 2 milioane de ani, P\u0103m\u00e2ntul a \u00eenghe\u0163at de tot \u015fi nu mai era protejat de Soare. De ce?"},"content":{"rendered":"
\"\"<\/a>
Imagine:<\/strong> pixabay.com<\/strong><\/a> (Commons Creative – free)<\/figcaption><\/figure>\n

Oamenii de \u0219tiin\u021b\u0103 cred c\u0103 loca\u021bia Soarelui \u00een spa\u021biu poate influen\u021ba istoria P\u0103m\u00e2ntului mai mult dec\u00e2t se credea anterior. Autorii unui nou studiu publicat \u00een revista „Nature Astronomy”<\/em><\/strong> consider\u0103 c\u0103 o perioad\u0103 foarte lung\u0103 de sc\u0103dere semnificativ\u0103 a temperaturii pe P\u0103m\u00e2nt a avut loc ca urmare a ciocnirii sistemului solar cu un nor interstelar.<\/p>\n

\u00cen urm\u0103 cu aproximativ 2 milioane de ani, a \u00eenceput pe P\u0103m\u00e2nt o epoc\u0103 glaciar\u0103 lung\u0103, care s-a \u00eencheiat \u00een aproximativ 12.000 ani. Oamenii de \u0219tiin\u021b\u0103 cred c\u0103 aceste epoci glaciare multiple ar fi putut fi cauzate de schimb\u0103rile \u00een \u00eenclinarea sau rota\u021bia planetei, de deplasarea pl\u0103cilor tectonice, de erup\u021bii vulcanice \u0219i de nivelurile ridicate de dioxid de carbon din atmosfer\u0103. \u00cens\u0103, autorii noului studiu cred c\u0103 P\u0103m\u00e2ntul a \u00eenghe\u021bat nu ca urmare a schimb\u0103rilor de mediu de pe planet\u0103, ci datorit\u0103 unui factor extern.<\/p>\n

Astrofizicienii au g\u0103sit dovezi c\u0103 acum aproximativ 2 milioane de ani, sistemul solar s-a ciocnit cu un nor interstelar foarte dens, care a afectat heliosfera. Astfel, spun oamenii de \u0219tiin\u021b\u0103, loca\u021bia Soarelui \u00een galaxie poate influen\u021ba istoria P\u0103m\u00e2ntului mai mult dec\u00e2t se credea anterior. Sistemul solar este \u00eenconjurat de o bul\u0103 gigantic\u0103 de plasm\u0103 numit\u0103 heliosfer\u0103. Existen\u021ba sa este sus\u021binut\u0103 \u00een mod constant de fluxurile de particule solare sau de v\u00e2ntul solar care iese din Soare. Heliosfera protejeaz\u0103 P\u0103m\u00e2ntul \u0219i locuitorii s\u0103i de radia\u021biile galactice d\u0103un\u0103toare.<\/p>\n

Autorii cred c\u0103 ciocnirea cu norul interstelar au f\u0103cut ca heliosfera s\u0103 se mic\u015foreze \u0219i, pentru o scurt\u0103 perioad\u0103 de timp, P\u0103m\u00e2ntul \u0219i alte planete ale sistemului solar au fost \u00een afara influen\u021bei heliosferei. Adic\u0103, acest eveniment a influen\u021bat clima de pe P\u0103m\u00e2nt, ceea ce a dus la r\u0103cirea acestuia.<\/p>\n

Folosind modelarea computerizat\u0103, astrofizicienii au descoperit unde se aflau Soarele \u0219i heliosfera \u00een urm\u0103 cu 2 milioane de ani. Oamenii de \u0219tiin\u021b\u0103 au studiat, de asemenea, mi\u0219carea mai multor nori interstelari mari, reci \u0219i den\u0219i, const\u00e2nd \u00een principal din hidrogen. Dup\u0103 cum a ar\u0103tat modelarea, ciocnirea unuia dintre norii interstelari cu heliosfera a f\u0103cut ca P\u0103m\u00e2ntul s\u0103 fie expus influen\u021bei mediului interstelar umplut cu diferite elemente chimice, inclusiv fier \u0219i plutoniu.<\/p>\n

Datorit\u0103 faptului c\u0103 P\u0103m\u00e2ntul nu a fost protejat, multe elemente radioactive au ajuns cu u\u0219urin\u021b\u0103 pe planet\u0103. Aceste date sunt \u00een concordan\u021b\u0103 cu datele geologice care arat\u0103 niveluri ridicate de izotopi de fier-60 \u0219i plutoniu-244 \u00een oceanul \u0219i ghea\u021ba de pe P\u0103m\u00e2nt cu aproximativ 2 milioane de ani \u00een urm\u0103. De \u00eendat\u0103 ce norul interstelar a \u00eencetat s\u0103 influen\u021beze heliosfera, aceasta din urm\u0103 a \u00eenconjurat din nou toate planetele sistemului solar cu protec\u021bia sa. Oamenii de \u0219tiin\u021b\u0103 sugereaz\u0103 c\u0103 o coliziune similar\u0103 ar putea ap\u0103rea din nou \u00een 1-2 milioane de ani.<\/p>\n

Sursa:<\/strong> studiul \u015ftiin\u0163ific „A possible direct exposure of the Earth to the cold dense interstellar medium 2\u20133\u2009Myr ago” \/ nature.com<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Oamenii de \u0219tiin\u021b\u0103 cred c\u0103 loca\u021bia Soarelui \u00een spa\u021biu poate influen\u021ba istoria P\u0103m\u00e2ntului mai mult dec\u00e2t se credea anterior. Autorii unui nou studiu publicat \u00een revista „Nature Astronomy” consider\u0103 c\u0103 o perioad\u0103 foarte lung\u0103 de sc\u0103dere semnificativ\u0103 a temperaturii pe … <\/p>\n

Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":91116,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[5636,102,2502,356,1438,9873,1941,1578,5832,2635,4188,1604,105,299,4882,3204,2364,865,2358,4477],"class_list":["post-91115","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-astrofizician","tag-astronomie","tag-atmosfera","tag-dioxid-de-carbon","tag-era-glaciara","tag-eruptii-vulcanice","tag-fier","tag-gheata","tag-heliosfera","tag-hidrogen","tag-nor-interstelar","tag-ocean","tag-pamant","tag-planete","tag-plutoniu","tag-radiatii","tag-revista","tag-soare","tag-temperatura","tag-vant-solar","resize-featured-image"],"yoast_head":"\nCercet\u0103torii au descoperit: acum 2 milioane de ani, P\u0103m\u00e2ntul a \u00eenghe\u0163at de tot \u015fi nu mai era protejat de Soare. 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