NSES Content Standard B  Physical Science: Motions and forces Grades 9-12, page 180 Gravitation is a universal force that each mass exerts on any other mass. The strength of the gravitational attractive force between two masses is proportional to the masses and inversely proportional to the square of the distance between them.

 
Benchmark 4G The Physical Setting: Forces of Nature
Grades 6-8, page 95
Every object exerts gravitational force on every other object. The force depends on how much mass the objects have and on how far apart they are. The force is hard to detect unless at least one of the objects has a lot of mass.

Benchmark 4G The Physical Setting: Forces of Nature
Grades 9-12, page 96
Gravitational force is an attraction between masses. The strength of the force is proportional to the masses and weakens rapidly with increasing distance between them.