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Résumé
Anyone who studies astronomy must soon encounter the ubiquitous and seemingly mystical series of letters that divides the stars into their seven groups, OBAFGKM.
Connectez-vous pour ajouter ce livre à votre bibliothèque.
Anyone who studies astronomy must soon encounter the ubiquitous and seemingly mystical series of letters that divides the stars into their seven groups, OBAFGKM.