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'''Kep1er ''' (케플러) (also stylized as Kepler) is a K-pop project girl group formed through the MNET survival show , ''Girls Planet 999''. The final lineup was announced on October 22, 2021, during the final episode of Girls Planet 999. "Kep1er" was a name suggested by viewers of the Girls Planet 999 show through the website Naver. It refers to Johannes Kepler, a German astronomer and mathematician from the 16th and 17th centuries who gave his name to his laws of planetary motion, among many other things. The name also kept its relation to Girls Planet 999 by continuing the space-related theme from the show's name.