Co zp\u016fsobuje vznik neobvykl\u00fdch uzl\u016f plynu a prachu v planet\u00e1rn\u00edch mlhovin\u00e1ch? Tyto uzly, kter\u00e9 lze pozorovat nap\u0159\u00edklad v Prstencov\u00e9 mlhovin\u011b, mlhovin\u011b \u201e\u010cinka\u201c a v NGC 2392, nebyly zpo\u010d\u00e1tku p\u0159edpov\u011bzeny a jejich p\u016fvod st\u00e1le nen\u00ed zcela objasn\u011bn. Zde je zachycen fascinuj\u00edc\u00ed sn\u00edmek \u010d\u00e1sti mlhoviny Helix po\u0159\u00edzen\u00fd vesm\u00edrn\u00fdm dalekohledem Jamese Webba, kter\u00fd v infra\u010derven\u00e9m sv\u011btle odhaluje \u00fa\u017easn\u00e9 detaily. Hmotnost t\u011bchto komet\u00e1rn\u00edch uzl\u016f je srovnateln\u00e1 s hmotnost\u00ed Zem\u011b, jejich velikost v\u0161ak obvykle n\u011bkolikr\u00e1t p\u0159evy\u0161uje ob\u011b\u017enou dr\u00e1hu Pluta. Jedna z hypot\u00e9z o fragmentaci a v\u00fdvoji t\u011bchto uzl\u016f po\u010d\u00edt\u00e1 s t\u00edm, \u017ee st\u00e1vaj\u00edc\u00ed plyn je vytla\u010dov\u00e1n m\u00e9n\u011b hust\u00fdm, ale vysoce energetick\u00fdm hv\u011bzdn\u00fdm v\u011btrem z centr\u00e1ln\u00ed hv\u011bzdy, kter\u00e1 proch\u00e1z\u00ed v\u00fdvojem. Mlhovina Helix je jedn\u00edm z nejbli\u017e\u0161\u00edch p\u0159\u00edklad\u016f planet\u00e1rn\u00ed mlhoviny, kter\u00e1 vznikla na konci \u017eivota hv\u011bzdy podobn\u00e9 Slunci. Mlhovina Helix, jej\u00ed\u017e technick\u00e9 ozna\u010den\u00ed je NGC 7293, le\u017e\u00ed ve vzd\u00e1lenosti p\u0159ibli\u017en\u011b 650 sv\u011bteln\u00fdch let ve sm\u011bru souhv\u011bzd\u00ed Vodn\u00e1\u0159e (Aquarius). Open Science: Prohl\u00e9dn\u011bte si v\u00edce ne\u017e 4 000 k\u00f3d\u016f v knihovn\u011b zdrojov\u00fdch k\u00f3d\u016f pro astrofyziku (Astrophysics Source Code Library)<\/p>\n
<\/p>\n
**Credit**: NASA<\/p>\n","protected":false},"excerpt":{"rendered":"
Co zp\u016fsobuje vznik neobvykl\u00fdch uzl\u016f plynu a prachu v planet\u00e1rn\u00edch mlhovin\u00e1ch? Tyto uzly, kter\u00e9 lze pozorovat nap\u0159\u00edklad v Prstencov\u00e9 mlhovin\u011b, mlhovin\u011b \u201e\u010cinka\u201c a v NGC 2392, nebyly zpo\u010d\u00e1tku p\u0159edpov\u011bzeny a […]<\/p>\n","protected":false},"author":1,"featured_media":3996,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3995","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nasa"],"_links":{"self":[{"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/posts\/3995","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/comments?post=3995"}],"version-history":[{"count":0,"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/posts\/3995\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/media\/3996"}],"wp:attachment":[{"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/media?parent=3995"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/categories?post=3995"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/astrohodonin.cz\/index.php\/wp-json\/wp\/v2\/tags?post=3995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}