gravitation

The agents which assist gravitation in bearing this detritus downward are many, but they all work together for the same end.

For instance, a theory of creation which would neglect the attraction of gravitation would be manifestly false.

It was one of the great forces of nature, which we call gravitation, and the force which kept it in motion we call momentum.

Clusters of stars may give us velocities much more remarkable still, but which are explained by the theory of gravitation.

Universal gravitation, invisible force, which the visible universe (what we call matter) obeys.