His significant contributions include those in the fields of gravitational lensing, galaxy dynamics and large-scale motions in the Universe, including the Great Attractor.

Rossby waves (or planetary waves) are large-scale motions in the atmosphere whose restoring force is the variation in Coriolis effect with latitude.

The air can rise due to convection, large-scale atmospheric motions, or a physical barrier such as a mountain (orographic lift).

Relative to it, all large-scale motion should show no preferred direction.

They also contribute to understanding of earthquakes; the structure of earth's crust, mantle, and core; and the large-scale motions and deformation of the tectonic plates.

We consider these large-scale motions in the next section.

Unless Pr > 1, there is vigorous disorganized small-scale motion as well as the rather coherent large-scale motion of the thermals.

In horizontal advection conditions, the winds blow across the surface of the earth with very little if any large-scale upward motion.

Seventy-seven years later, Isaac Newton described large-scale motion throughout the universe.

The large-scale motions of the gases were detectable only in the relatively short radio waves picked up by the Hat Creek observatory.