Chris Cantell Discusses Science: Vesmirny dopad Zuzana Valkova

Meteority, asteroidy, komety. "Lietaju" vo vesmire zvycajne po svojich vlastnych drahach. Ale niekedy sa stane, ze zo svojej drahy vyjdu a priblizia sa k Zemi. Potom sa dostanu do gravitacneho pola Zeme, takze su pritahovane priamo k nej. Ale mozete byt kludni, toto sa deje iba kazdych 1000 rokov. Ziaden problem. Teda aspon dufam.Zaujimalo ma, aky je vlastne rozdiel medzi tymito objektami. Asteroid je obrovsky objekt, ktory moze byt nazyvany aj mensou planetou alebo planetoidom.Meteority su male vesmirne objekty, mensie ako asteroid a vacsie ako atom alebo molekula. Ked meteority a asteroidy dosiahnu zemsku atmosferu volaju ich meteory. Zmeni sa ich kompozicia a stanu sa velmi viditelnymi. Meteor moze cestu atmosferou prezit, potom opat stvrdne (v niektorych pripadoch sa ho mozno dokonca aj dotknut).Niektori vedci prisli s myslienkou, ze vsetky podstatne zmeny na Zemi boli sposobene vesmirnymi objektami. Napriklad zmena klimy, vyhynutie dinosaurov & vsetky tieto veci. Niektori si dokonca myslia, ze voda v oceanoch bola prinesena prave pomocou vesmirneho objektu. A nie iba voda, tiez aj zivot!Co sa vlastne deje pocas dopadu? Ked objekt leti cez atmosferu, zahrieva sa, zacne sa tavit a je velmi ziarivy, ako horiaca gula. Ak tato gula pristane na zemi, moze sposobit obrovske skody. Je to ako atomova bomba, ale samozrejme ze bez radiacie. Dokaze zabit a znicit vsetko v okruho niekolko kilometrov.

related story: http://news.yahoo.com/s/ap/20080129/ap_on_sc/asteroid_recalculated;_ylt=ApjkvqClo47VcjQusKEynCys0NUE

by Zuzana Valkova for PocketNews (http://pocketnews.tv)

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edited by Tatiana Kucharikova