>>14270584its built around mass or volume vs effect. this is like capacitors vs batteries. in this set volume of space i can have a battery that can output 3.7 volts at 10 amps for 1 hour or OR i can have a capacitor which can store the same 3.7 volts but at 1/1000 the current for only 1 second
gravity goes beyond magnetism at a point and no magnet will ever have a field that stretches across half a galaxy but a massive black hole (mass wise) can have gravitation influences that stretch across multiple solar systems and in theory could even be large enough for a galaxy to be held in its influence