Planetary objects, Small bodies, Gravity:
-Position of an object can be described
-An object's motion can be described
-Change in motion is caused by pushing or pulling
-Light travels in a straight line
-Motion can be described from an objects position and direction and speed
-Objects in the solar system are in regular and predictable motion
-Gravity is the force that keeps objects in orbits around the sun and the rest of the motion in the solar system.
-Laws of motion can be calculated precisely by knowing the effects of forces on objects
-Objects in the universe are in motion and have been since the "big bang"