What causes masse structures to move in General relativity?

Question

What law of motion are in Relativity theory?

Answer 1

I don't understand your question, but General relativity states that acceleration is equivalent to a gravitational force. I don't see how your question relates to anything...but Newton's laws of physics have to be altered slightly to fit speeds near the speed of light.

Answer 2

In general relativity objects follow "curved" paths due to the curvature of space created by objects with mass. Planets follow the "shortest path" in this curved space-time.

So the law of motion is to follow a shortest path line.