{"id":112711,"date":"2026-06-09T19:14:14","date_gmt":"2026-06-09T19:14:14","guid":{"rendered":"https:\/\/www.europesays.com\/cz\/112711\/"},"modified":"2026-06-09T19:14:14","modified_gmt":"2026-06-09T19:14:14","slug":"meteorit-ze-sahary-muze-byt-ulomkem-zanikle-protoplanety-z-pocatku-slunecni-soustavy","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/cz\/112711\/","title":{"rendered":"Meteorit ze Sahary m\u016f\u017ee b\u00fdt \u00falomkem zanikl\u00e9 protoplanety z\u00a0po\u010d\u00e1tk\u016f Slune\u010dn\u00ed soustavy"},"content":{"rendered":"

Meteorit ozna\u010dovan\u00fd jako Northwest Africa 12774, zkr\u00e1cen\u011b NWA 12774, byl objeven v\u00a0Saharsk\u00e9 pou\u0161ti v\u00a0roce 2019.\u00a0Pat\u0159\u00ed mezi vz\u00e1cnou skupinu meteorit\u016f zvanou angrity. Z\u00a0v\u00edce ne\u017e 80\u00a0tis\u00edc meteorit\u016f, kter\u00e9 byly na Zemi dosud nalezeny, jich v\u011bdci mezi angrity za\u0159adili jen 68. <\/p>\n

Vz\u00e1cnost a\u00a0neobvykl\u00e9 chemick\u00e9 slo\u017een\u00ed z\u00a0nich d\u011blaj\u00ed cenn\u00e9 sv\u011bdky nejstar\u0161\u00ed historie Slune\u010dn\u00ed soustavy. Angrity toti\u017e vznikly jen n\u011bkolik milion\u016f let po jej\u00edm zrozen\u00ed, pat\u0159\u00ed tak mezi nejstar\u0161\u00ed zn\u00e1m\u00e9 vulkanick\u00e9 horniny. V\u011bdci je pova\u017euj\u00ed za jak\u00e9si \u201egeologick\u00e9 arch\u00edvy\u201c obdob\u00ed, z\u00a0n\u011bho\u017e se na Zemi zachovalo jen velmi m\u00e1lo p\u0159\u00edm\u00fdch stop.<\/p>\n

Foto: CU Boulder\/Aaron Bell<\/p>\n

Rentgenov\u00fd sn\u00edmek meteoritu NWA 12774<\/p>\n

Ne asteroid, ale planet\u00e1rn\u00ed embryo<\/p>\n

Nov\u00e1 studie publikovan\u00e1 v\u00a0\u010dasopise Earth and Planetary Science Letters<\/a> se zam\u011b\u0159ila na krystaly klinopyroxenu uvnit\u0159 meteoritu NWA 12774.\u00a0Ty byly v\u00fdjime\u010dn\u011b bohat\u00e9 na hlin\u00edk, co\u017e je podle autor\u016f studie zn\u00e1mka vzniku za velmi vysok\u00e9ho tlaku. V\u00fdzkumn\u00fd t\u00fdm proto zrekonstruoval podm\u00ednky, p\u0159i nich\u017e mohly tyto krystaly vyr\u016fst.<\/p>\n

<\/a><\/p>\n

V\u00fdsledek v\u011bdce p\u0159ekvapil. Klinopyroxen v\u00a0NWA 12774\u00a0podle v\u00fdpo\u010dt\u016f pot\u0159eboval tlak nejm\u00e9n\u011b 17,5\u00a0kilobaru. Pro srovn\u00e1n\u00ed: tlak na dn\u011b Mari\u00e1nsk\u00e9ho p\u0159\u00edkopu, nejhlub\u0161\u00edho zn\u00e1m\u00e9ho m\u00edsta oce\u00e1nsk\u00e9ho dna, dosahuje pouze jednoho kilobaru. Takov\u00e9 podm\u00ednky podle v\u011bdc\u016f nemohl vytvo\u0159it asteroid o\u00a0pr\u016fm\u011bru n\u011bkolika des\u00edtek nebo stovek kilometr\u016f. Mate\u0159sk\u00e9 t\u011bleso muselo b\u00fdt mnohem v\u011bt\u0161\u00ed. <\/p>\n

Krystaly v\u00a0meteoritu NWA 12774\u00a0si nav\u00edc udr\u017eely ostr\u00e9 hrany, kter\u00e9 by se p\u0159i dlouh\u00e9m pobytu v\u00a0hork\u00e9m nitru mate\u0159sk\u00e9ho t\u011blesa nezachovaly. To nazna\u010duje, \u017ee krystalizovaly relativn\u011b bl\u00edzko povrchu. Aby i\u00a0v tak mal\u00e9 hloubce dosahoval tlak hodnoty 17,5\u00a0kilobaru, muselo m\u00edt toto t\u011bleso podle kalkulac\u00ed polom\u011br p\u0159es 1800\u00a0kilometr\u016f. Polom\u011br M\u011bs\u00edce je pro srovn\u00e1n\u00ed 1737\u00a0km.<\/p>\n

P\u0159i anal\u00fdze meteoritu v\u011bdci krom\u011b klinopyroxenu identifikovali i\u00a0dal\u0161\u00ed miner\u00e1ly, nap\u0159\u00edklad oliv\u00edn.<\/p>\n

Zanikl\u00fd sv\u011bt z\u00a0ran\u00e9 Slune\u010dn\u00ed soustavy<\/p>\n

Co se s\u00a0touto protoplanetou stalo, nen\u00ed jist\u00e9. Kolem mlad\u00e9ho Slunce se pohybovalo mnoho protoplanet a\u00a0dal\u0161\u00edch t\u011bles, kter\u00e9 do sebe nar\u00e1\u017eely, spojovaly se nebo se naopak t\u0159\u00ed\u0161tily na men\u0161\u00ed \u00falomky. Z\u00a0takov\u00fdch koliz\u00ed nakonec vze\u0161ly i\u00a0terestrick\u00e9 planety Merkur, Venu\u0161e, Zem\u011b a\u00a0Mars.<\/p>\n

Foto: CU Boulder\/John Kashuba<\/p>\n

P\u0159i pohledu p\u0159es polariza\u010dn\u00ed filtry meteorit NWA 12774\u00a0p\u0159ipom\u00edn\u00e1 kaleidoskop.<\/p>\n

Mate\u0159sk\u00fd objekt, z\u00a0n\u011bho\u017e poch\u00e1z\u00ed NWA 12774, mohl b\u00fdt p\u0159i jedn\u00e9 z\u00a0t\u011bchto sr\u00e1\u017eek rozbit. Jeho \u010d\u00e1sti se mohly rozpt\u00fdlit po Slune\u010dn\u00ed soustav\u011b a\u00a0jeden z\u00a0\u00falomk\u016f n\u00e1sledn\u011b skon\u010dit v\u00a0saharsk\u00e9m p\u00edsku.<\/p>\n

\u201eJe neuv\u011b\u0159iteln\u00e9 si p\u0159edstavit, \u017ee kdysi existovalo tak velk\u00e9 vesm\u00edrn\u00e9 t\u011bleso,\u201c \u0159ekl pro port\u00e1l Phys<\/a> hlavn\u00ed autor studie Aaron Bell. \u201eV\u00edme, \u017ee existovalo, jen proto, \u017ee se n\u00e1hodou n\u011bkolik jeho \u00falomk\u016f dostalo na Zemi.\u201c<\/p>\n

<\/a>Pestr\u00e1 minulost na\u0161eho sol\u00e1rn\u00edho syst\u00e9mu<\/p>\n

Meteorit NWA 12774\u00a0tak roz\u0161i\u0159uje p\u0159edstavu o\u00a0tom, jak rozmanit\u00e1 byla ran\u00e1 Slune\u010dn\u00ed soustava. \u0160lo o\u00a0dynamick\u00e9 prost\u0159ed\u00ed pln\u00e9 do\u010dasn\u00fdch sv\u011bt\u016f, z\u00a0nich\u017e n\u011bkter\u00e9 zanikly d\u0159\u00edve, ne\u017e mohly dor\u016fst do stabiln\u00ed podoby.<\/p>\n

Auto\u0159i studie z\u00e1rove\u0148 upozor\u0148uj\u00ed, \u017ee NWA 12774\u00a0nemus\u00ed b\u00fdt jedin\u00fdm d\u016fkazem podobn\u00e9ho \u201eztracen\u00e9ho sv\u011bta\u201c.<\/p>\n

\u201eV muzejn\u00edch sb\u00edrk\u00e1ch i\u00a0v\u00fdzkumn\u00fdch laborato\u0159\u00edch le\u017e\u00ed mnoho meteorit\u016f, kter\u00e9 dosud nebyly d\u016fkladn\u011b prozkoum\u00e1ny. Podobn\u00fdch protoplanet, o\u00a0nich\u017e zat\u00edm nev\u00edme, bylo pravd\u011bpodobn\u011b v\u00edce,\u201c dodal Aaron Bell pro port\u00e1l Space<\/a>.<\/p>\n

\ud83d\udea8 SCIENTISTS HAVE FOUND A FRAGMENT OF ONE OF THE EARLIEST PLANETARY BODIES IN THE SOLAR SYSTEM. WE MAYBE HOLDING A FRAGMENT OF AN ALIEN PLANET.<\/p>\n

A rare meteorite discovered in the Sahara Desert, known as Erg Chech 002, has been dated to roughly 4.566 billion years old making it\u2026 pic.twitter.com\/X4kDTpCr8m<\/a><\/p>\n

\u2014 TheNewPhysics (@CharlesMullins2) June 7, 2026<\/a><\/p>\n

Co je asteroid a\u00a0co protoplaneta?<\/p>\n

Asteroid neboli planetka je mal\u00e9 t\u011bleso ob\u00edhaj\u00edc\u00ed kolem Slunce, kter\u00e9 nikdy nedorostlo do planet\u00e1rn\u00edch rozm\u011br\u016f. V\u011bt\u0161ina asteroid\u016f se nach\u00e1z\u00ed v\u00a0p\u00e1su mezi Marsem a\u00a0Jupiterem. M\u00edvaj\u00ed nepravideln\u00fd tvar a\u00a0jejich velikost se pohybuje od n\u011bkolika metr\u016f a\u017e po stovky kilometr\u016f.<\/p>\n

Protoplaneta je v\u011bt\u0161\u00ed z\u00e1rodek planety. Vznikala postupn\u00fdm spojov\u00e1n\u00edm prachu, kamen\u016f a\u00a0men\u0161\u00edch t\u011bles v\u00a0mlad\u00e9 Slune\u010dn\u00ed soustav\u011b. N\u011bkter\u00e9 protoplanety d\u00e1l rostly a\u00a0staly se z\u00a0nich dne\u0161n\u00ed planety, jin\u00e9 byly p\u0159i sr\u00e1\u017ek\u00e1ch rozbity nebo pohlceny v\u011bt\u0161\u00edmi t\u011blesy.<\/p>\n

<\/a><\/a>