Egy r\u00f6pke fogalmi tiszt\u00e1z\u00e1s el\u00f6lj\u00e1r\u00f3ban \u2013 ahogy ezt Rezsabek N\u00e1ndor is tette \u2013, a meteor az a f\u00e9nyjelens\u00e9g, amelyet az \u0171rben kering\u0151 kisebb k\u00f6vek, porszemek, azaz a meteoroidok keltenek a l\u00e9gk\u00f6rben, mik\u00f6zben, a nagy sebess\u00e9g miatti s\u00farl\u00f3d\u00e1st\u00f3l felizzanak, ezeket nevezi a k\u00f6znyelv hull\u00f3csillagoknak. Azt a k\u0151zetanyagot, ami a zuhan\u00e1s ut\u00e1n bel\u00e9p a f\u00f6ld l\u00e9gk\u00f6r\u00e9be, nevezz\u00fck meteoritnak, s ebb\u0151l k\u00f6vetkezik, hogy ezek becsap\u00f3d\u00e1sa hozza l\u00e9tre azokat a kr\u00e1tereket, amelyekr\u0151l az el\u0151ad\u00e1s sz\u00f3lt.<\/p>\n
Rezsabek N\u00e1ndor \u00fati c\u00e9lja tavaly a Ries-kr\u00e1ter volt, amely Eur\u00f3pa legismertebb becsap\u00f3d\u00e1si helye N\u00e9metorsz\u00e1gban, a Duna fels\u0151 foly\u00e1s\u00e1n\u00e1l. Ma m\u00e1r biztosnak tekinthet\u0151 \u2013 a k\u00e9telyek az 1960-as \u00e9vekben oszlottak el v\u00e9glegesen \u2013, hogy a 24 kilom\u00e9ter \u00e1tm\u00e9r\u0151j\u0171 medenc\u00e9t meteoritbecsap\u00f3d\u00e1s hozta l\u00e9tre, k\u00f6r\u00fclbel\u00fcl 14,8 milli\u00f3 \u00e9vvel ezel\u0151tt. A hatalmas kr\u00e1ter jellegzetess\u00e9gei a mai napig kimutathatok, noha a k\u00f6zep\u00e9n egy h\u00faszezer lakos\u00fa v\u00e1ros, N\u00f6rdlingen \u00e1ll \u2013 s m\u00e9g 99 kisebb telep\u00fcl\u00e9s l\u00e9tezik a ter\u00fcleten \u2013, amiben semmi k\u00fcl\u00f6n\u00f6s nincsen, hiszen a becsap\u00f3d\u00e1st k\u00f6vet\u0151en a kr\u00e1terek t\u00f6bbs\u00e9g\u00e9ben \u00fajra kialakult az \u00e9let, \u00e9s m\u00e1ra m\u00e1r kihalt csig\u00e1k, illetve az eml\u0151s\u00f6knek is v\u00e1ltozatos fajai n\u00e9pes\u00edtett\u00e9k be a ter\u00fcletet, majd k\u00e9s\u0151bb az ember is megtelepedett. <\/p>\n
A n\u00f6rdlingeni Ries-kr\u00e1ter mellett egy kisebb is tal\u00e1lhat\u00f3, ez a Steinheim n\u00e9vre hallgat, amelynek az \u00e1tm\u00e9r\u0151je 3,8 kilom\u00e9ter, s joggal felt\u00e9telezik, mivel m\u00e1r t\u00f6bb kett\u0151s kisbolyg\u00f3t is ismer\u00fcnk, hogy a k\u00e9t becsap\u00f3d\u00e1sra egyid\u0151ben ker\u00fclt sor, a k\u00e9t kr\u00e1tert egy 100 \u00e9s egy 1 kilom\u00e9ter \u00e1tm\u00e9r\u0151j\u0171 kisbolyg\u00f3 \u00fct\u00f6tte. A F\u00f6lddel val\u00f3 \u00fctk\u00f6z\u00e9s erej\u00e9t \u00e9s sebess\u00e9g\u00e9t j\u00f3l \u00e9rz\u00e9kelteti, hogy ezek az \u00e9gitestek a becsap\u00f3d\u00e1s el\u0151tti pillanatokban l\u00e9nyeg\u00e9ben elp\u00e1rologtak, s a kr\u00e1tereket a l\u00f6k\u00e9shull\u00e1mok hozt\u00e1k l\u00e9tre.<\/p>\n
A kr\u00e1terek teh\u00e1t nem hatalmas \u2013 vagy olykor kisebb \u2013 \u201eg\u00f6dr\u00f6k\u201d lehetnek csak, noha ilyenek is vannak a F\u00f6ld\u00f6n, mint p\u00e9ld\u00e1ul az \u00e9szak-amerikai Ariz\u00f3n\u00e1ban l\u00e9v\u0151 h\u00edres Barringer-kr\u00e1ter, de gondolhatunk a Hold-kr\u00e1terekre is. \u00d6sszesen mintegy 190 bizony\u00edtottan kozmikus eredet\u0171 becsap\u00f3d\u00e1snyomot vettek eddig lajstromba bolyg\u00f3nkon, ezek k\u00f6z\u00fcl 41 tal\u00e1lhat\u00f3 Eur\u00f3p\u00e1ban. <\/p>\n
Rezsabek N\u00e1ndor 2018-ban szervezte az els\u0151 utaz\u00e1st a lengyelorsz\u00e1gi Poznan mellett l\u00e9v\u0151 Morasko-kr\u00e1terhez, amelynek \u00e9rdekess\u00e9ge, hogy egy n\u00e9met geol\u00f3gus az els\u0151 vil\u00e1gh\u00e1bor\u00faban l\u00f6v\u00e9sz\u00e1rkot \u00e1s\u00f3 katonak\u00e9nt fedezte f\u00f6l a nyomait a mintegy 5000 \u00e9vvel kor\u00e1bban keletkezett kr\u00e1ternek. A n\u00e9metorsz\u00e1gi ikerkr\u00e1tert tavaly kerest\u00e9k f\u00e9l, az idei terv pedig a sv\u00e9dorsz\u00e1gi Mien-kr\u00e1ter megismer\u00e9se lesz, ami ugyan mind\u00f6ssze kilenc kilom\u00e9ter \u00e1tm\u00e9r\u0151j\u0171, de 120 milli\u00f3 \u00e9vvel ezel\u0151tt alak\u00edtotta ki egy becsap\u00f3d\u00f3 k\u0151meteorit.
\nAz exped\u00edci\u00f3k sor\u00e1n els\u0151sorban k\u00f6rnyezettani szempontb\u00f3l vizsg\u00e1lj\u00e1k meg a kr\u00e1tereket, term\u00e9szetv\u00e9delmi, \u00e1llat- \u00e9s n\u00f6v\u00e9nytani saj\u00e1toss\u00e1gok \u00e1llnak a kutat\u00e1s k\u00f6z\u00e9ppontj\u00e1ban, a f\u00f6ldrajziak mellett persze, az\u00e9rt belef\u00e9r a programba az is, hogy k\u0151zetmint\u00e1kat gy\u0171jtsenek, m\u00e9r\u00e9seket v\u00e9gezzenek vagy megvizsg\u00e1lj\u00e1k a kr\u00e1terek geol\u00f3giai, hidrobiol\u00f3giai jellegzetess\u00e9geit.<\/p>\n
<\/p>","protected":false},"excerpt":{"rendered":"
Rezsabek N\u00e1ndor \u2013 eredetileg m\u00e9rn\u00f6k, azt\u00e1n amat\u0151r csillag\u00e1sz, tudom\u00e1nyos \u00fajs\u00e1g\u00edr\u00f3 \u00e9s ismeretterjeszt\u0151 \u2013 \u00e9rdekl\u0151d\u00e9se l\u00e9nyeg\u00e9ben a fia miatt, illetve az \u00e1ltala kedvelt Meteorvad\u00e1szok c\u00edm\u0171 film miatt fordult a F\u00f6ld\u00f6n f\u00f6llelhet\u0151 meteoritkr\u00e1terek fel\u00e9.<\/p>","protected":false},"author":8,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"cikk_cimkek":[5],"content_flags":[350],"content_icons":[],"class_list":["post-6247","post","type-post","status-publish","format-standard","hentry","category-erdmost","cikk_cimkek-kultura","content_flags-erdekes"],"acf":[],"_links":{"self":[{"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/posts\/6247","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/comments?post=6247"}],"version-history":[{"count":0,"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/posts\/6247\/revisions"}],"wp:attachment":[{"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/media?parent=6247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/categories?post=6247"},{"taxonomy":"cikk_cimkek","embeddable":true,"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/cikk_cimkek?post=6247"},{"taxonomy":"content_flags","embeddable":true,"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/content_flags?post=6247"},{"taxonomy":"content_icons","embeddable":true,"href":"https:\/\/erdmost.hu\/en\/wp-json\/wp\/v2\/content_icons?post=6247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}