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La presenza di acqua sulla Luna era già nota, in particolare nel sottosuolo, ma le analisi della NASA pubblicate dalla rivista PNAS confermano ora che sulla superficie del satellite della Terra si trova anche del ghiaccio. La prova è giunta uno strumento inviato nel 2008 con una sonda indiana e capace di misurare l'assorbimento di luce infrarossa.
Il nuovo studio, che si aggiunge ad altri del passato, mostra accumuli ai due poli, in crateri che non vengono raggiunti dalla luce solare e dove la temperatura non supera mai i -150 °C. "Una quantità sufficiente, con uno spessore di pochi millimetri, potrebbe costituire una risorsa importante per future missioni di esplorazione lunare", sostengono gli scienziati, essendo più facile da raggiungere di quella sotterranea. L'ultima volta che l'uomo è stato sulla Luna risale al 1972.
pon/ATS
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