La vita nell'universo potrebbe essere non soltanto molto diffusa, ma anche antichissima. È lo scenario aperto dall'individuazione di cinque pianeti dalle dimensioni confrontabili con quelle della Terra.
Questo sistema solare, che ruota attorno alla stella Kepler 444, s'è formato 11,2 miliardi di anni fa e ha quindi un'età più che doppia rispetto al nostro, come è riuscito a dimostrare il gruppo guidato da Tiago Campante, dell'Università di Birmingham.
La scoperta potrebbe avere implicazioni di vasta portata, facendo luce sull'era in cui sono comparsi i primi mondi.
ANSA/dg
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