{"id":671063,"date":"2026-01-12T16:26:04","date_gmt":"2026-01-12T16:26:04","guid":{"rendered":"https:\/\/microscopemedia.com\/?p=671063"},"modified":"2026-01-12T16:26:04","modified_gmt":"2026-01-12T16:26:04","slug":"cum-ajung-stelele-sa-arunce-materie-in-univers-o-descoperire-intamplatoare","status":"publish","type":"post","link":"https:\/\/microscopemedia.com\/?p=671063","title":{"rendered":"Cum ajung stelele s\u0103 arunce materie \u00een Univers: o descoperire \u00eent\u00e2mpl\u0103toare"},"content":{"rendered":"
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Un sistem stelar aflat la mai pu\u021bin de 500 de ani-lumin\u0103 de P\u0103m\u00e2nt a oferit astronomilor o dovad\u0103 rar\u0103 despre felul \u00een care se nasc jeturile de materie \u00een Univers. Observ\u00e2nd steaua binar\u0103 R Aquarii, cercet\u0103tori estonieni au descoperit c\u0103 aceste jeturi apar exact \u00een clipa \u00een care cele dou\u0103 stele se apropie cel mai mult una de cealalt\u0103.<\/p>\n

Descoperirea nu a fost planificat\u0103. Astronomii de la Observatorul Tartu din Estonia \u00eencercau s\u0103 calculeze mai precis orbitele celor dou\u0103 stele, folosind Telescopul Gemini South din Chile, un instrument uria\u0219, amplasat la mare altitudine, care le permite s\u0103 observe detalii invizibile cu telescoapele obi\u0219nuite. La un moment dat, datele nu se potriveau cu a\u0219tept\u0103rile.<\/p>\n

Nu era o stea, ci un \u201ebulg\u0103re\u201d de materie<\/h2>\n

\u201eObiectul pe care l-am g\u0103sit era, de fapt, mai departe \u0219i la un unghi diferit\u201d, a relatat Tiina Liimets, coordonatoarea studiului, citat\u0103 luni de postul public estonian ERR News<\/a>. \u201eAm crezut c\u0103 am f\u0103cut o gre\u0219eal\u0103. Eram at\u00e2t de concentra\u021bi pe ceea ce ne a\u0219teptam s\u0103 vedem, \u00eenc\u00e2t nu am putut recunoa\u0219te ce era, de fapt, acolo\u201d.<\/p>\n

Dup\u0103 ce au reluat analiza, cercet\u0103torii au realizat c\u0103 nu observaser\u0103 o stea, ci un \u201ebulg\u0103re\u201d dens de materie, parte a unui jet care se \u00eendep\u0103rta rapid de sistem.<\/p>\n

Proces cosmic \u00een trei pa\u0219i<\/h2>\n

R Aquarii este alc\u0103tuit dintr-o gigant\u0103 ro\u0219ie \u2013 o stea aflat\u0103 la finalul vie\u021bii \u2013 \u0219i o pitic\u0103 alb\u0103, mult mai mic\u0103 \u0219i mai dens\u0103. Giganta \u00ee\u0219i pierde constant straturile exterioare, iar pitica alb\u0103 \u201efur\u0103\u201d o parte din acest material \u00een timp ce o orbiteaz\u0103 o dat\u0103 la aproximativ 40 de ani.<\/p>\n

\u00cen momentul \u00een care cele dou\u0103 stele<\/a> ajung la cea mai mic\u0103 distan\u021b\u0103 dintre ele, fenomen numit periastru, transferul de materie devine brusc mult mai intens. \u00cen jurul piticei albe se formeaz\u0103 un disc instabil, care nu poate \u201e\u00eenghi\u021bi\u201d tot surplusul.<\/p>\n

Excesul este aruncat \u00een spa\u021biu sub form\u0103 de jeturi extrem de \u00eenguste, \u00een direc\u021bii opuse. \u201eEste ca apa care curge dintr-un robinet \u2013 jetul este la fel de \u00eengust\u201d, au explicat cercet\u0103torii.<\/p>\n

Un r\u0103spuns c\u0103utat de mult timp<\/h2>\n

Astronomii b\u0103nuiau de mult timp c\u0103 aceste jeturi apar tocmai \u00een momentul apropierii maxime dintre cele dou\u0103 stele, \u00eens\u0103 nu avuseser\u0103 p\u00e2n\u0103 acum dovezi directe. Tehnologia actual\u0103 \u0219i rezolu\u021bia foarte mare ob\u021binut\u0103 prin tehnica de \u201eimagistic\u0103 speckle\u201d, care combin\u0103 rapid mai multe imagini pentru a elimina distorsiunile produse de atmosfera P\u0103m\u00e2ntului, au permis, \u00een sf\u00e2r\u0219it, confirmarea ipotezei.<\/p>\n","protected":false},"excerpt":{"rendered":"

Un sistem stelar aflat la mai pu\u021bin de 500 de ani-lumin\u0103 de P\u0103m\u00e2nt a oferit astronomilor o dovad\u0103 rar\u0103 despre felul \u00een care se nasc jeturile de materie \u00een Univers. … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":671064,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"Default","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/671063"}],"collection":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=671063"}],"version-history":[{"count":0,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/671063\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/media\/671064"}],"wp:attachment":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=671063"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=671063"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=671063"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}