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NASA ScienceCasts: οι ερασιτέχνες αστρονόμοι παρατηρούν τον ISON
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Η συμβολή των ερασιτεχνών αστρονόμων στην μελέτη του κομήτη ISON
Όμιλος Φίλων Αστρονομίας
NASA (Organization)
ISON
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