Η NASA ετοιμάζεται να στείλει ανθρώπους κοντά στη Σελήνη για πρώτη φορά μετά από πάνω από πενήντα χρόνια. Η αποστολή Artemis 2 θα διαρκέσει εννέα μέρες και δύο ώρες — αν και η NASA εξακολουθεί να την αποκαλεί «δεκαήμερη αποστολή». Στο τραπέζι και ένα ιστορικό ρεκόρ απόστασης από τη Γη.
Πενήντα χρόνια μετά το Apollo, η NASA επιστρέφει στη Σελήνη — αυτή τη φορά με τέσσερις αστροναύτες στο νέο διαστημόπλοιο Orion. Η αποστολή Artemis 2 δεν θα προσεδαφιστεί στη σεληνιακή επιφάνεια, αλλά θα πετάξει γύρω από τη Σελήνη σε μια τροχιά ελεύθερης επιστροφής — μια διαδρομή που χρησιμοποιεί τη βαρύτητα για να φέρει το σκάφος πίσω στη Γη χωρίς να χρειαστεί να ανάψει τις μηχανές. Η εκτόξευση θα γίνει από το Launch Complex 39B στο Kennedy Space Center, με τον πύραυλο Space Launch System να αναλαμβάνει να σηκώσει το Orion στο διάστημα.
Τα πρώτα εικοσιπέντε περίπου λεπτά μετά την εκτόξευση είναι γεμάτα δράση: αποχωρισμός των στερεών ενισχυτών, σβήσιμο των κύριων κινητήρων, τοποθέτηση σε αρχική τροχιά. Πριν όμως το Orion κατευθυνθεί προς τη Σελήνη, θα περάσει μια ολόκληρη μέρα σε τροχιά γύρω από τη Γη. Αυτό το διάστημα δεν είναι απλώς αναμονή — είναι κρίσιμο για τον έλεγχο των συστημάτων του σκάφους, και ιδιαίτερα των συστημάτων υποστήριξης ζωής που δεν δοκιμάστηκαν πλήρως στην άκρωτη αποστολή Artemis 1 το 2022.
Μέσα σε αυτή την τροχιά, το πλήρωμα θα εκτελέσει και μια ιδιαίτερη δοκιμή: θα πλησιάσει χειροκίνητα το Orion σε απόσταση δέκα μέτρων από το ανώτερο στάδιο του πυραύλου, σε μια άσκηση που προετοιμάζει μελλοντικές αποστολές όπου το σκάφος θα πρέπει να συνδεθεί με σεληνιακή κάψουλα προσεδάφισης. «Θέλουμε να δούμε πώς αντιδρά το σκάφος, να νιώσουν οι αστροναύτες πώς “οδηγείται”», εξήγησε ο Howard Hu, διευθυντής του προγράμματος Orion στη NASA.
Περίπου εικοσιπέντε ώρες μετά την εκτόξευση, η κύρια μηχανή του Orion θα ανάψει για να θέσει το σκάφος σε πορεία προς τη Σελήνη. Η διαδρομή θα διαρκέσει αρκετές μέρες, κατά τις οποίες το πλήρωμα θα πραγματοποιήσει επιστημονικές παρατηρήσεις της σεληνιακής επιφάνειας — ένα πρόγραμμα που σχεδιάστηκε σε συνεργασία με επιστήμονες, αλλά θα οριστικοποιηθεί μόλις μετά την εκτόξευση, ανάλογα με τις συνθήκες. Λίγο πάνω από πέντε μέρες μετά την εκκίνηση, το Orion θα φτάσει στο πιο απομακρυσμένο σημείο του ταξιδιού. Αν η εκτόξευση γίνει στις αρχές Απριλίου, η αποστολή έχει τη δυνατότητα να σπάσει το ρεκόρ μεγαλύτερης απόστασης από τη Γη για επανδρωμένη αποστολή — ένα ρεκόρ που κρατά το Apollo 13 από το 1970.
Η επιστροφή θα ξεκινήσει σχεδόν εννέα μέρες μετά την εκτόξευση. Το Orion θα αποχωριστεί από την υπηρεσιακή μονάδα του και 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