Earth-Sun-Moon System
Develop and use a model of the Earth-sun-moon system to describe the cyclic patterns of lunar phases, eclipses of the sun and moon, and seasons.

Gravity and Motions in Space
Develop and use a model to describe the role of gravity in the motions within galaxies and the solar system.

Scale Properties in the Solar System
Analyze and interpret data to determine scale properties of objects in the solar system.