What is the difference between a trajectory and a "megatrajectory"? Thanks, Clément.
The prefices macro, mega, giga, etc. are used to indicate long spans of geological or universal time. A trajectory that sustains itself over millennia would be a megatrajectory, over billennia a gigatrajectory, or for an indeterminate long period of time a macrotrajectory. Perhaps we should reword. -JS