"Counting." . . "Solar system" . . "Solar system." . "Planets." . . . . "Eight spinning planets" . . . . "8 spinning planets" . "Juvenile works" . "Solar system -- Juvenile literature" . . . "\"Get to explore the solar system one planet at a time, counting down from Mercury to Nepture!\"--Page 4 of cover." . . . . . "8 Spinning Planets" . .