3I/ATLAS, il terzo oggetto interstellare mai confermato, potrebbe essersi formato 10-12 miliardi di anni fa: più vecchio del Sole stesso. Ecco cosa hanno scoperto Webb, il VLT dell'ESO e la sonda JUICE.
La scoperta di un nuovo visitatore interstellare Il 1º luglio 2025 gli astronomi del progetto ATLAS (Asteroid Terrestrial-impact Last Alert System) hanno individuato un debole puntino in movimento nei cieli del Cile. In meno di 24 ore è stato chiaro che non si trattava di una cometa qualunque: la sua orbita fortemente iperbolica indicava un’origine interstellare, al di fuori del nostro Sistema Solare[1][2]. L’oggetto, inizialmente catalogato come C/2025 N1 (ATLAS), è stato ribattezzato 3I/ATLAS: il numero 3 e la lettera “I” segnalano infatti che si tratta del terzo oggetto interstellare mai osservato, dopo 1I/ʻOumuamua nel 2017 e 2I/Borisov nel 2019[3].…
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