Science: Is Gravity Weakening?

Elephants may never fly, but they may have quite a load off their feet in some far distant day. Though scientists generally assume that gravitation is as unchanging as any of nature's absolute laws, Physics Professor Robert H. Dicke of Princeton has a different theory. A firm believer in the theory of the expanding universe, he also believes that gravitation gets weaker as the universe expands and permits gravitational forces to penetrate more space. By his guess, the force of gravitation is about 13% less today than when the earth was formed 4½ billion years ago.

Why gravitation should be weakened by...