Benchmark 4A
The Physical Setting: The Universe
Grades 6-8, page 64

Nine planets of very different size, composition, and surface features move around the sun in nearly circular orbits. Some planets have a great variety of moons and even flat rings of rock and ice particles orbiting around them. Some of these planets and moons show evidence of geologic activity. The earth is orbited by one moon, many artificial satellites, and debris.
 

NSES Content Standard D  Earth and Space Science: Earth in the Solar System  Grades 5-8, page 160  The earth is the third planet from the sun in a system that includes the moon, the sun, eight other planets and their moons, and smaller objects, such as asteroids and comets. The sun, an average star, is the central and largest body in the solar system.  NSES Content Standard D  Earth and Space Science: Earth in the Solar System  Grades 5-8, page 160  Most objects in the solar system are in regular and predictable motion. Those motions explain such phenomena as the day, the year, phases of the moon, and eclipses.