Astronomi australiani hanno individuato le stelle più vecchie finora conosciute, risalenti a prima che si formasse la Via Lattea, quando l'età dell'Universo era di appena 300 milioni di anni.
I nove corpi celesti, situati vicino al centro della nostra galassia, di cui potrebbero essere il nucleo primordiale, sono sorprendentemente puri, ma contengono materiale di un loro predecessore, morto in un'enorme esplosione.
Per scoprirli, dopo averne passati in rassegna 5 milioni, è stato usato il telescopio SkyMapper, occhio che esplora lo spazio nei pressi di Canberra.
ATS/dg
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