Significados de gravitational mass en inglés

Durations are dictated by the placement of the system's primary station in relation to the system's center of gravitational mass.

There is inertial mass (the resistance to change in motion by a force) and there is gravitational mass that is proportional to the gravitational force.

Gravitational Mass: One way to model the gravitational interaction is to say that it is a force between two objects with mass (gravitational mass).