Fill in the Blanks Solar SystemOnline version In this activity you need to find the missing words. by CAAFI 2 servicio social 1 approved appears discovered solar listed larger Saturn Sun system classification distance centre 2006 Composition of the system . Located at the of the solar system and influencing the motion of all the other bodies through its gravitational force is the , which in itself contains more than 99 percent of the mass of the . The planets , in order of their outward from the Sun , are Mercury , Venus , Earth , Mars , Jupiter , , Uranus , and Neptune . Four planets ? Jupiter through Neptune ? have ring systems , and all but Mercury and Venus have one or more moons . Pluto had been officially among the planets since it was in 1930 orbiting beyond Neptune , but in 1992 an icy object was discovered still farther from the Sun than Pluto . Many other such discoveries followed , including an object named Eris that to be at least as large as Pluto . It became apparent that Pluto was simply one of the members of this new group of objects , collectively known as the Kuiper belt . Accordingly , in August the International Astronomical Union ( IAU ) , the organization charged by the scientific community with classifying astronomical objects , voted to revoke Pluto ? s planetary status and place it under a new called dwarf planet . For a discussion of that action and of the definition of planet by the IAU , see planet .
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