{"id":978,"date":"2004-11-15T14:43:00","date_gmt":"2004-11-15T13:43:00","guid":{"rendered":"https:\/\/kids.esa.int\/star_death\/"},"modified":"2026-10-08T00:34:26","modified_gmt":"2026-10-07T22:34:26","slug":"star_death","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/ro\/star_death\/","title":{"rendered":"Moartea unei stele"},"content":{"rendered":"
\n

Majoritatea stelelor au nevoie de milioane de ani pentru a muri. C\u00e2nd o stea precum Soarele \u00ee\u0219i epuizeaz\u0103 \u00eentregul stoc de hidrogen, aceasta se extinde \u0219i devine o gigant\u0103 ro\u0219ie. Aceasta poate avea un diametru de milioane de kilometri \u2013 suficient de mare \u00eenc\u00e2t s\u0103 \u00eenghit\u0103 planetele Mercur \u0219i Venus.<\/p>\n<\/div>\n

Dup\u0103 ce \u00ee\u0219i expulzeaz\u0103 straturile exterioare, 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.<\/p>\n

Stelele cu o mas\u0103 de peste opt ori mai mare dec\u00e2t cea a Soarelui \u00ee\u0219i \u00eencheie via\u021ba foarte brusc. C\u00e2nd r\u0103m\u00e2n f\u0103r\u0103 combustibil, se umfl\u0103 \u0219i devin supergigante ro\u0219ii. \u00cencearc\u0103 s\u0103 supravie\u021buiasc\u0103 arz\u00e2nd diferite tipuri de combustibil, dar acest lucru func\u021bioneaz\u0103 doar c\u00e2teva milioane de ani. Apoi se destram\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 supergigantului (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":"

Most stars take millions of years to die. When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant. This may […]<\/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\/2003\/05\/ngc_6369_a_cosmic_ghost2\/17884213-2-eng-GB\/NGC_6369_a_cosmic_ghost.jpg","esa_banner_description":"NGC 6369, a cosmic ghost","esa_banner_credit":"NASA and The Hubble Heritage Team (STScI\/AURA)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/05\/NGC_6369_a_cosmic_ghost2","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-978","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\/978","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=978"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/978\/revisions"}],"predecessor-version":[{"id":2121,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/978\/revisions\/2121"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/media?parent=978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/categories?post=978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/tags?post=978"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/panel?post=978"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/language?post=978"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/age?post=978"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/duration?post=978"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/resource_type?post=978"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/audience?post=978"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/wf_post_folders?post=978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}