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Scienceil y a 4 heures
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Chasse à la 9e planète : voilà pourquoi il pourrait bien y avoir un objet massif encore non détecté aux confins du système solaire
Depuis près d’un siècle, l’hypothèse d’une planète encore invisible gravitant au-delà de Neptune alimente les spéculations. Le système solaire n’a pas encore livré tous ses secrets.
