Mars had reached a later phase of planetary evolution than Earth and possibly had evolved intelligent life earlier, too.

The mass spread into a disk and almost as quickly coalesced again, reenacting planetary evolution at a billion times the speed.

Comparing the dubious scientific theories about planetary evolution to State-sanctioned racism?

The world you see before you has endured for perhaps five billion years since its formation by the ordinary processes of stellar and planetary evolution.

Prot also mentions that our planet just arrived at a minor stage of planetary evolution - he thinks we are as yet children.

The cadaverous-faced biologist said in his cold, logical voice: "This thing has arms and legs, a purely planetary evolution.

Killeen frowned, realizing that he would need to know some planetary evolution, in addition to everything else.

This thing, as far as I can make it out from here, has arms and legs, a development of purely planetary evolution.

A planet with an atmosphere, this close to a nova, after only fifty-thousand years have passed, does not correspond to any known pattern of planetary evolution.

He has also contributed to the field of planetary chemistry and planetary evolution.