{"id":8075,"date":"2023-12-11T23:23:34","date_gmt":"2023-12-11T20:23:34","guid":{"rendered":"https:\/\/diagnozabam.ro\/sfaturi\/?p=8075"},"modified":"2025-04-02T14:10:23","modified_gmt":"2025-04-02T11:10:23","slug":"acum-4-5-miliarde-de-ani-o-alta-planeta-s-a-ciocnit-cu-pamantul-am-putea-sa-fi-gasit-ramasitele-ei","status":"publish","type":"post","link":"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/acum-4-5-miliarde-de-ani-o-alta-planeta-s-a-ciocnit-cu-pamantul-am-putea-sa-fi-gasit-ramasitele-ei\/","title":{"rendered":"Acum 4.5 miliarde de ani, o alt\u0103 planet\u0103 s-a ciocnit cu P\u0103m\u00e2ntul. Am putea s\u0103 fi g\u0103sit r\u0103m\u0103\u0219i\u021bele ei."},"content":{"rendered":"<h1>Acum 4.5 miliarde de ani, o alt\u0103 planet\u0103 s-a ciocnit cu P\u0103m\u00e2ntul. Am putea s\u0103 fi g\u0103sit r\u0103m\u0103\u0219i\u021bele ei.<\/h1>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-8077\" src=\"https:\/\/diagnozabam.ro\/sfaturi\/wp-content\/uploads\/2023\/12\/Image_6.webp\" alt=\"Acum 4.5 miliarde de ani, o alt\u0103 planet\u0103 s-a ciocnit cu P\u0103m\u00e2ntul. Am putea s\u0103 fi g\u0103sit r\u0103m\u0103\u0219i\u021bele ei. - Image 6\" width=\"859\" height=\"1080\" title=\"Acum 4.5 miliarde de ani, o alt\u0103 planet\u0103 s-a ciocnit cu P\u0103m\u00e2ntul. Am putea s\u0103 fi g\u0103sit r\u0103m\u0103\u0219i\u021bele ei. - Image 6\"><\/p>\n<p>Acum aproximativ 4,5 miliarde de ani, sistemul solar era un fel de joc gigantic de pinball cosmic. \u00cen acele vremuri timpurii, un corp planetar de dimensiunile lui Marte s-a ciocnit de P\u0103m\u00e2ntul \u00eenc\u0103 \u00een formare. Ciocnirea a fost at\u00e2t de puternic\u0103 \u00eenc\u00e2t a descompus protoplaneta impactant\u0103, poreclit\u0103 Theia, \u0219i a trimis cantit\u0103\u021bi uria\u0219e de material \u00een orbita P\u0103m\u00e2ntului &#8211; material care s-a coagulat ulterior \u00een Luna.<\/p>\n<p>Un nou studiu sugereaz\u0103 c\u0103, \u00een timpul acestei coliziuni, Theia a l\u0103sat unele dintre materialele sale la suprafa\u021ba P\u0103m\u00e2ntului \u00een curs de formare \u0219i c\u0103 aceste resturi s-au scufundat \u00een planeta noastr\u0103. Publicat \u00een jurnalul Nature, studiul arat\u0103 c\u0103 ast\u0103zi, materialul provenit de la Theia ar putea explica dou\u0103 buc\u0103\u021bi imense \u0219i dense \u00een manta P\u0103m\u00e2ntului.<\/p>\n<p>Oamenii de \u0219tiin\u021b\u0103 de pe P\u0103m\u00e2nt \u0219tiu de decenii c\u0103 exist\u0103 aglomer\u0103ri de material mai dens de dimensiuni continentale \u00een partea de jos a mantalei, \u00een apropierea grani\u021bei cu nucleul. Acest nou studiu, realizat de geofizicianul Qian Yuan de la Caltech \u0219i colegii s\u0103i, utilizeaz\u0103 simul\u0103ri ale impactului de formare a Lunii, precum \u0219i evolu\u021bia interiorului P\u0103m\u00e2ntului, pentru a aborda unde ar putea fi ascunse resturile impactorului \u0219i cum s-ar fi putut schimba \u00een timp.<\/p>\n<p>&#8222;Este un rezultat foarte incitant \u0219i provocator&#8221;, spune cercet\u0103torul planetar Robin Canup de la Southwest Research Institute din Boulder, Colorado, care nu a f\u0103cut parte din studiu. &#8222;Ar \u00eensemna c\u0103 avem material care ne poate spune mai multe despre Theia \u0219i ne poate ajuta s\u0103 \u00een\u021belegem mai bine &#8230; impactul de formare a Lunii.&#8221;<\/p>\n<p>Interiorul P\u0103m\u00e2ntului<\/p>\n<p>Asemenea unei cepe, interiorul P\u0103m\u00e2ntului este compus din straturi. \u00cens\u0103, spre deosebire de leguma respectiv\u0103, nucleul planetei noastre este fierbinte, dens \u0219i \u00een mare parte metalic, format dintr-un strat exterior de lichid \u00een rota\u021bie \u00een jurul unei sfere mai dense cu diametrul de 1.500 de mile. \u00cen afara acestor dou\u0103 straturi ale nucleului este manta imens\u0103, care ocup\u0103 peste 80% din volumul planetei noastre. Deasupra mantalei este crusta, suprafa\u021ba.<\/p>\n<p>Manta este locul unde se \u00eent\u00e2mpl\u0103 multe lucruri: pl\u0103cile continentale se deplaseaz\u0103 \u0219i se ciocnesc, iar magmele se scurg. De asemenea, este dificil de accesat direct datorit\u0103 ad\u00e2ncimii sale, a\u0219a c\u0103, pentru a \u00een\u021belege mai bine mantaua, cercet\u0103torii m\u0103soar\u0103 cum se deplaseaz\u0103 undele seismice prin ea \u00een timpul cutremurelor. Pe m\u0103sur\u0103 ce acele unde trec prin materiale cu densit\u0103\u021bi diferite, ele \u00ee\u0219i schimb\u0103 viteza sau direc\u021bia. Adun\u00e2nd aceste informa\u021bii, cercet\u0103torii pot cartografia practic interiorul planetei noastre.<\/p>\n<p>Studiile de genul acesta \u00een ultimele decenii au ar\u0103tat c\u0103 exist\u0103 dou\u0103 bule uria\u0219e \u00een p\u0103r\u021bile inferioare ale mantalei &#8211; una sub Africa de Sud \u0219i alta sub Oceanul Pacific &#8211; care difer\u0103 \u00een densitate \u0219i compozi\u021bie fa\u021b\u0103 de materialul \u00eenconjur\u0103tor. Undele seismice \u00eencetinesc c\u00e2nd trec prin aceste bule, iar geofizicienii le-au numit: provincii mari cu vitez\u0103 sc\u0103zut\u0103 de forfecare (LLSVP). Aceste regiuni sunt mai dense dec\u00e2t restul mantalei \u0219i par s\u0103 existe de miliarde de ani.<\/p>\n<p>Cu toate acestea, oamenii de \u0219tiin\u021b\u0103 nu sunt siguri cum au ajuns aceste bule LLSVP \u00een mantaua P\u0103m\u00e2ntului. Poate c\u0103, sugereaz\u0103 noul studiu, aceste aglomer\u0103ri au provenit de la protoplaneta care s-a ciocnit cu P\u0103m\u00e2ntul, conduc\u00e2nd la formarea Lunii.<\/p>\n<p>Fabricarea Lunii<\/p>\n<p>C\u00e2nd impactorul Theia a lovit P\u0103m\u00e2ntul acum 4,5 miliarde de ani, s-a dezintegrat, iar nori de moloz \u0219i vapori au \u00eenv\u0103luit P\u0103m\u00e2ntul, adun\u00e2ndu-se pentru a forma Luna. \u00cen ultimii 50 de ani, oamenii de \u0219tiin\u021b\u0103 au studiat mostrele lunare colectate \u00een timpul misiunilor Apollo \u0219i din c\u0103derile de meteoriti \u0219i au combinat aceste informa\u021bii cu simul\u0103rile computerizate pentru a reconstitui aceast\u0103 poveste, teoria principal\u0103 privind formarea Lunii.<\/p>\n<p>Dar \u00eenc\u0103 exist\u0103 unele \u00eentreb\u0103ri cu privire la aceast\u0103 teorie, inclusiv una pe care geofizicianul Qian Yuan o aminte\u0219te dintr-o clas\u0103 de absolvire: de ce nu am g\u0103sit r\u0103m\u0103\u0219i\u021be ale lui Theia aici pe P\u0103m\u00e2nt?<\/p>\n<p>Yuan s-a dedicat acestei \u00eentreb\u0103ri \u00een lucrarea sa de tez\u0103 la Universitatea de Stat Arizona \u0219i, \u00eempreun\u0103 cu consilierul s\u0103u de cercetare Mingming Li, a colaborat cu al\u021bi geofizicieni \u0219i oameni de \u0219tiin\u021b\u0103 care modeleaz\u0103 ipotezele privind impactul P\u0103m\u00e2nt-Lun\u0103.<\/p>\n<p>Astronomul computational Hongping Deng de la Observatorul Astronomic Shanghai din China s-a concentrat pe simularea coliziunii dintre Theia \u0219i proto-P\u0103m\u00e2nt \u0219i modul \u00een care materialul ar fi putut s\u0103 se amestece sau s\u0103 nu se amestece \u00een straturile P\u0103m\u00e2ntului. Modelul s\u0103u computerizat a inclus detalii mai fine dec\u00e2t simul\u0103rile anterioare, dezv\u0103luind c\u0103 unele dintre materialele Theia care au topit \u00een timpul coliziunii au r\u0103mas pe P\u0103m\u00e2nt. Modelul sugereaz\u0103 c\u0103 acest material era mai dens dec\u00e2t mantaua superioar\u0103 a proto-P\u0103m\u00e2ntului \u0219i s-a scufundat \u00een mantaua inferioar\u0103, unde a r\u0103mas sub form\u0103 de aglomer\u0103ri identificabile, f\u0103r\u0103 a se amesteca niciodat\u0103.<\/p>\n<p>&#8222;\u00cencercam doar s\u0103 le amestec&#8221;, spune Deng despre lucr\u0103rile sale de simulare, &#8222;dar ele refuz\u0103 s\u0103 se amestece.&#8221;<\/p>\n<p>Amestecarea materialelor \u00een mantaua P\u0103m\u00e2ntului<\/p>\n<p>Cea mai mare \u00eentrebare despre noul model, spune Canup, este dac\u0103 materialul provenit din impact poate &#8222;evita s\u0103 fie amestecat \u0219i omogenizat \u00een mantaua P\u0103m\u00e2ntului \u00een urm\u0103torii patru \u0219i jum\u0103tate de miliarde de ani.&#8221;<\/p>\n<p>Unii cercet\u0103tori nu sunt convin\u0219i. &#8222;\u00cen simul\u0103rile noastre, mantaua Theia \u0219i mantaua P\u0103m\u00e2ntului au tendin\u021ba de a fi bine amestecate&#8221;, spune planetologul Miki Nakajima de la Universitatea din Rochester din New York. Cercet\u0103rile sale din ultimii ani s-au concentrat pe modul \u00een care straturile evolueaz\u0103 \u00een planetele st\u00e2ncoase ale sistemului solar.<\/p>\n<p>&#8222;Nu cred c\u0103 materialul impactor ar fi complet amestecat, dar cantitatea de amestecare care a avut loc este subestimat\u0103 \u00een acest studiu&#8221;, adaug\u0103 geodinamistul Maxim Ballmer de la University College London. Ballmer, de\u0219i nu este asociat cu noul articol Nature, a colaborat cu Deng la un studiu similar acum c\u00e2\u021biva ani.<\/p>\n<p>Oamenii de \u0219tiin\u021b\u0103 sunt de acord c\u0103 aceste regiuni dense din mantaua P\u0103m\u00e2ntului exist\u0103 de mult timp &#8211; dar exact c\u00e2t de mult timp \u0219i de unde provin \u00eenc\u0103 mai este subiect de dezbatere.<\/p>\n<p>&#8222;Exist\u0103 o explica\u021bie alternativ\u0103 pentru formarea acestor aglomer\u0103ri&#8221;, spune Ballmer. El indic\u0103 dovezi conform c\u0103rora mult din ceea ce este acum mantaua solid\u0103 fusese magm\u0103 fierbinte la \u00eenceputul evolu\u021biei P\u0103m\u00e2ntului, \u00eenainte de a se separa \u00een straturile actuale. Stratul superior s-a solidificat rapid pe m\u0103sur\u0103 ce radia c\u0103ldur\u0103 \u00een spa\u021biu. Stratul inferior, totu\u0219i, s-a solidificat \u00eencet \u0219i astfel a avut timp s\u0103 se diferen\u021bieze \u00een bule mai dense \u0219i zone mai pu\u021bin dense, conform unor studii.<\/p>\n<p>Urmeaz\u0103 s\u0103 se compare semn\u0103turile chimice ale materialului din aceste aglomer\u0103ri \u0219i de pe Lun\u0103, care este format\u0103 \u00een mare parte din Theia. &#8222;Dac\u0103 au aceea\u0219i semn\u0103tur\u0103 geo-chimic\u0103, trebuie s\u0103 provin\u0103 de la aceea\u0219i planet\u0103&#8221;, spune Yuan.<\/p>\n<p>Dar adunarea de material nou pentru studiu este mai u\u0219or de spus dec\u00e2t de f\u0103cut. Geofizicienii nu pot s\u0103 sape suficient de ad\u00e2nc \u00een P\u0103m\u00e2nt pentru a preleva direct mostre din aceste aglomer\u0103ri. Cu toate acestea, Yuan spune c\u0103 rocile din interiorul ad\u00e2nc ajung uneori la suprafa\u021b\u0103, precum Basaltele Insulelor Oceanului.<\/p>\n<p>Suprafa\u021ba Lunii a fost expus\u0103 la miliarde de ani de uzur\u0103 spa\u021bial\u0103 \u0219i poate fi contaminat\u0103 de meteorite, astfel c\u0103 cercet\u0103torii ar dori s\u0103 analizeze materialul din mantaua lunar\u0103. Cu toate acestea, mostrele pe care oamenii de \u0219tiin\u021b\u0103 le au \u00een laboratoarele de pe P\u0103m\u00e2nt sunt \u00een mare parte de la suprafa\u021b\u0103.<\/p>\n<p>Piese noi ale Lunii ar putea trebui s\u0103 a\u0219tepte p\u00e2n\u0103 la o misiune de returnare a mostrelor \u00een regiunea de sud, unde mantaua este mai expus\u0103 \u0219i accesibil\u0103. P\u00e2n\u0103 atunci, oamenii de \u0219tiin\u021b\u0103 vor continua s\u0103 \u00eembun\u0103t\u0103\u021beasc\u0103 modelele lor pentru a c\u0103uta fantoma lui Theia.<\/p>\n<p>Source: <a href=\"https:\/\/www.nationalgeographic.com\">https:\/\/www.nationalgeographic.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Acum aproximativ 4,5 miliarde de ani, sistemul solar era un fel de joc gigantic de pinball cosmic. \u00cen acele vremuri timpurii, un corp planetar de dimensiunile lui Marte s-a ciocnit&hellip;<\/p>\n","protected":false},"author":1,"featured_media":8077,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3283],"tags":[398,399,3372,22,415,2064,21,3168,116,1862,1893,1482,3370,1846,66,2760,601,3371,3369,153],"class_list":["post-8075","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-africa","tag-africa-de-sud","tag-apollo","tag-bam","tag-china","tag-complet","tag-diagnoza","tag-lege","tag-lichid","tag-luna","tag-meta","tag-ocean","tag-pamant","tag-schimba","tag-sfaturi","tag-spatiu","tag-studiu","tag-terra","tag-theia","tag-viteza"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.2 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Acum 4.5 miliarde de ani, o alt\u0103 planet\u0103 s-a ciocnit cu P\u0103m\u00e2ntul. 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