{"id":196,"date":"2021-12-02T12:44:26","date_gmt":"2021-12-02T11:44:26","guid":{"rendered":"https:\/\/kids.esa.int\/stars2\/"},"modified":"2026-10-08T00:25:22","modified_gmt":"2026-10-07T22:25:22","slug":"stars2","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/ro\/stars2\/","title":{"rendered":"Stele"},"content":{"rendered":"
\n

La fel ca oamenii, stelele se nasc, \u00eemb\u0103tr\u00e2nesc \u0219i mor. Locul \u00een care se nasc este reprezentat de nori uria\u0219i \u0219i reci de gaz \u0219i praf, cunoscu\u021bi sub numele de \u2018nebuloase\u2019. Cea mai faimoas\u0103 dintre acestea este Nebuloasa Orion, care poate fi observat\u0103 cu ochiul liber.<\/p>\n<\/div>\n

La miliarde de ani dup\u0103 na\u0219terea sa, c\u00e2nd o stea de dimensiuni medii, precum Soarele, se apropie de sf\u00e2r\u0219itul vie\u021bii, aceasta se extinde \u0219i devine o gigant\u0103 ro\u0219ie. Diametrul acesteia poate ajunge la milioane de kilometri \u2013 c\u00e2nd Soarele va ajunge \u00een aceast\u0103 etap\u0103, va fi suficient de mare \u00eenc\u00e2t s\u0103 \u00eenghit\u0103 planetele Mercur \u0219i Venus!<\/p>\n

Dup\u0103 ce \u00ee\u0219i expulzeaz\u0103 straturile exterioare de gaz, steaua se pr\u0103bu\u0219e\u0219te, form\u00e2nd o pitic\u0103 alb\u0103 foarte dens\u0103. O linguri\u021b\u0103 de materie provenit\u0103 de la o pitic\u0103 alb\u0103 ar c\u00e2nt\u0103ri p\u00e2n\u0103 la 100 de tone! De-a lungul a miliarde de ani, pitica alb\u0103 se r\u0103ce\u0219te \u0219i devine invizibil\u0103. Dar nu-\u021bi face griji, asta nu se va \u00eent\u00e2mpla cu Soarele nostru dec\u00e2t peste aproximativ 5 miliarde de ani!<\/p>\n

Stelele mici au o durat\u0103 de via\u021b\u0103 \u00eendelungat\u0103, de peste 10 miliarde de ani. Moartea lor nu a fost niciodat\u0103 observat\u0103, dar se presupune c\u0103 \u00ee\u0219i vor \u00eencheia via\u021ba \u00een lini\u0219te \u0219i, \u00een cele din urm\u0103, se vor stinge treptat.<\/p>\n

\"Supernova
R\u0103m\u0103\u0219i\u021be de supernov\u0103<\/figcaption><\/figure>\n

Cele mai mari stele \u00ee\u0219i \u00eencheie via\u021ba foarte brusc. Spre sf\u00e2r\u0219itul vie\u021bii lor, ele se umfl\u0103 p\u00e2n\u0103 devin supergigante ro\u0219ii, \u00eenainte de a se dezintegra \u00een cele din urm\u0103 \u00eentr-o imens\u0103 explozie de supernov\u0103.<\/p>\n

Timp de aproximativ o s\u0103pt\u0103m\u00e2n\u0103, supernova str\u0103luce\u0219te mai puternic dec\u00e2t toate celelalte stele din galaxia sa. Apoi, str\u0103lucirea ei se estompeaz\u0103 rapid. Tot ce r\u0103m\u00e2ne este un obiect minuscul \u0219i dens \u2013 o stea de neutroni sau o gaur\u0103 neagr\u0103 \u2013 \u00eenconjurat de un nor \u00een expansiune de gaz extrem de fierbinte.<\/p>\n

Elementele formate \u00een interiorul supergigantei (cum ar fi oxigenul, carbonul \u0219i fierul) sunt \u00eempr\u0103\u0219tiate \u00een spa\u021biu. Acest praf stelar va da na\u0219tere, \u00een cele din urm\u0103, altor stele \u0219i planete!<\/p>","protected":false},"excerpt":{"rendered":"

Like people, stars are born, they grow old and they die. Their birth places are huge, cold clouds of gas and dust, known as ‘nebulas’. The most famous of these […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2004\/01\/nearby_galaxy_ngc_1569_is_a_hotbed_of_star_birth_activity2\/17880180-2-eng-GB\/Nearby_galaxy_NGC_1569_is_a_hotbed_of_star_birth_activity.jpg","esa_banner_description":"Nearby galaxy NGC 1569 is a 'hotbed' of star birth activity","esa_banner_credit":"ESA, NASA and Peter Anders (G\u00f6ttingen University Galaxy Evolution Group, Germany)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/01\/Nearby_galaxy_NGC_1569_is_a_hotbed_of_star_birth_activity2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,11,21],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-196","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-stars-and-galaxies","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/196","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/comments?post=196"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/196\/revisions"}],"predecessor-version":[{"id":4352,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/196\/revisions\/4352"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/media?parent=196"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/categories?post=196"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/tags?post=196"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/panel?post=196"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/language?post=196"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/age?post=196"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/duration?post=196"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/resource_type?post=196"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/audience?post=196"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/wf_post_folders?post=196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}