Gravity moves at speed of light? From where to where? How? Is gravity a solid object that can be moved? 

Gravity is inherited attraction force coexisting with masses/matters, constantly existing, never can be stopped. That is why planets can have stable orbits. If gravity travels at speed of light, takes 8 minutes to get to earth, since earth is moving, isn't gravity will be always missing earth? After gravity reaches earth, does it ever leave? Saying gravity moves at light speed is so stupid.