Acest metal, considerat de pamanteni deosebit de pretios, s-a format prin reactii nucleare in stele aflate la milioane de ani lumina de noi. In cadrul acestor procese, elementele se “ingrasa”, de exemplu din sulf se transforma in cupru, din cupru in aur. La un moment dat, aceste stele se prabusesc in interiorul lor din cauza propriei greutati, apoi explodeaza, imprastiind totul in spatiul cosmic, inclusiv aurul continut.
“Resturile acestor stele formeaza ŤdiscuriÅ¥ si ŤbulgariÅ¥ uriasi, care plutesc milioane de ani in spatiul cosmic. In momentul in care aceste resturi intalnesc traiectoria vreunei planete, sunt atrase de forta gravitationala a acesteia. La fel se intampla si pe Terra”, explica unul din cercetatorii care au emis aceasta ipoteza.
Se pare ca o astfel de ploaie de aur a avut loc pe Pamant in urma cu circa 200 de ani, cronicile vremii vorbind de un bulgare de aur de cateva kilograme care a cazut pe coliba unui bastinas din Ghana. In 1958, o echipa de cercetatori au descoperit in Australia un bulgare de aur care cantarea nu mai putin de 58 kg. Acesta provenea din spatiu, pentru ca a fost gasit in mijlocul unui crater destul de mare.
“Primele straturi ale scoartei planetei stau marturie ca din cand in cand spre Pamant ploua cu aur. Astfel se explica faptul ca deasupra unor roci care nu contin nici un fel de metale se afla, in diverse locuri, filoane groase de aur”, arata articolul din “Science”.
Chiar daca cercetatorii spun ca uriasa avere din spatiul cosmic nu va putea fi culeasa niciodata, ei sunt optimisti: poate ca urmatoarea ploaie de aur va avea loc peste doar cativa ani.
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