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Este vorba de particule de praf spațial vechi de 7,5 miliarde de ani, care ar putea proveni dintr-o stea care a murit. Pe Pământ nu există ceva mai vechi de atât.
Cercetători din SUA și Elveția analizau o porțiune dintr-un meteorit care a căzut în Australia în 1969. Fragmentele de rocă spațială au fost pisate și dizolvate în acid până când au rămas doar particulele de praf străvechi. Cercetărorii au folosit un izotop de neon ca să determine cât de mult particulele respective au stat în spațiu şi aşa au identificat vechimea.
Sistemul nostru solar s-a format acum circa 4,5 miliarde de ani.
Citeşte şi: NASA a descoperit un sistem solar cu opt planete, ca al nostru, dar mult mai mic
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