{"id":3496,"date":"2024-12-02T00:54:41","date_gmt":"2024-12-01T23:54:41","guid":{"rendered":"https:\/\/www.zahadyazajimavosti.cz\/?p=3496"},"modified":"2025-07-20T04:30:50","modified_gmt":"2025-07-20T02:30:50","slug":"svitila-na-zemi-dve-slunce","status":"publish","type":"post","link":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/2024\/12\/02\/svitila-na-zemi-dve-slunce\/","title":{"rendered":"Sv\u00edtila na Zemi dv\u011b Slunce?\u00a0"},"content":{"rendered":"

Jak p\u0159ed \u010dasem prob\u011bhlo m\u00e9dii, p\u0159ed 70 000 lety se k na\u0161emu Slunci p\u0159ibl\u00ed\u017eila Scholzova hv\u011bzda (1) na vzd\u00e1lenost 0,8 sv\u011bteln\u00e9ho roku, a tak pr\u00fd na\u0161i p\u0159edkov\u00e9 vid\u011bli na obloze dv\u011b Slunce. Opravdu?<\/strong><\/p>\n

Proto\u017ee tak hv\u011bzda prol\u00e9tla uvnit\u0159 vn\u011bj\u0161\u00edch hranic Slune\u010dn\u00ed soustavy, kter\u00e1 je dva sv\u011bteln\u00e9 roky, do\u0161lo k dosud nejt\u011bsn\u011bj\u0161\u00edmu p\u0159ibl\u00ed\u017een\u00ed jin\u00e9 hv\u011bzdy k na\u0161emu sol\u00e1rn\u00edmu syst\u00e9mu. To bylo d\u016fvodem k\u00a0tomuto tvrzen\u00ed. Nejbli\u017e\u0161\u00ed hv\u011bzda Alfa (Proxima) Centauri (2) je od n\u00e1s vzd\u00e1len\u00e1 4,2 sv\u011bteln\u00e9ho roku (ly).<\/p>\n

Scholzova hv\u011bzda (WISE 0720\u22120846)<\/em> je \u010derven\u00fd trpasl\u00edk, kter\u00fd je dnes od Slunce vzd\u00e1len 20 sv\u011bteln\u00fdch let. Jeho neviditeln\u00fdm pr\u016fvodcem je hn\u011bd\u00fd trpasl\u00edk, tedy chladn\u00e9 t\u011bleso, jeho\u017e velikost ani teplota nebyly dostate\u010dn\u00e9 k za\u017eehnut\u00ed termojadern\u00e9 reakce, nutn\u00e9 ke zm\u011bn\u011b objektu ve sv\u00edt\u00edc\u00ed hv\u011bzdu.<\/p>\n

Jen\u017ee tvrzen\u00ed o druh\u00e9m slunci je pon\u011bkud nadnesen\u00e9. Vzd\u00e1lenost 0,8 ly je sice mal\u00e1, ale \u010derven\u00e9ho trpasl\u00edka spektr\u00e1ln\u00ed t\u0159\u00eddy M9 s absolutn\u00ed hv\u011bzdnou velikost\u00ed 19 mag by v dob\u011b nejt\u011bsn\u011bj\u0161\u00edho p\u0159ibl\u00ed\u017een\u00ed ke Slunci bylo vid\u011bt jedin\u011b st\u0159edn\u011b velk\u00fdm amat\u00e9rsk\u00fdm dalekohledem. A ten na\u0161i p\u0159edkov\u00e9 rozhodn\u011b nem\u011bli, a tak tedy \u017e\u00e1dn\u00e9 „druh\u00e9 Slunce“ nevid\u011bli.<\/p>\n

\"\"<\/p>\n

Toto p\u0159ibl\u00ed\u017een\u00ed jin\u00e9 hv\u011bzdy nebylo ojedin\u011bl\u00e9. P\u0159ed 300 000 lety se k Slunci p\u0159ibl\u00ed\u017eil b\u00edl\u00fd trpasl\u00edk WD 0310\u2013688 (HIP 14754) (3) a v uplynul\u00fdch dvou mili\u00f3nech let se do na\u0161\u00ed bl\u00edzkosti dostalo celkem 9 ciz\u00edch hv\u011bzd.<\/p>\n

V budoucnu se k\u00a0n\u00e1m p\u0159ibl\u00ed\u017e\u00ed hv\u011bzda Gliese 710 (4), kter\u00e1 je od Slunce nyn\u00ed vzd\u00e1len\u00e1 63 sv\u011bteln\u00fdch let.<\/p>\n

Odkazy<\/em><\/strong><\/p>\n

(1) http:\/\/en.wikipedia.org\/wiki\/Scholz%27s_star<\/a><\/em><\/p>\n

(2) http:\/\/cs.wikipedia.org\/wiki\/Proxima_Centauri<\/a><\/em><\/p>\n

(3) http:\/\/es.wikipedia.org\/wiki\/Gliese_127.1<\/a><\/em><\/p>\n

(4) http:\/\/en.wikipedia.org\/wiki\/Gliese_710<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Jak p\u0159ed \u010dasem prob\u011bhlo m\u00e9dii, p\u0159ed 70 000 lety se k na\u0161emu Slunci p\u0159ibl\u00ed\u017eila Scholzova hv\u011bzda (1) na vzd\u00e1lenost 0,8<\/p>\n","protected":false},"author":1,"featured_media":429,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,19],"tags":[55,59],"class_list":["post-3496","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-veda","category-zahady","tag-astronomie","tag-vesmir"],"_links":{"self":[{"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/posts\/3496","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/comments?post=3496"}],"version-history":[{"count":2,"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/posts\/3496\/revisions"}],"predecessor-version":[{"id":4207,"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/posts\/3496\/revisions\/4207"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/media\/429"}],"wp:attachment":[{"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/media?parent=3496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/categories?post=3496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zahadyazajimavosti.cz\/index.php\/wp-json\/wp\/v2\/tags?post=3496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}