Hi, Is there a generally accepted description of the objects that make up a co-orbiting system? For example, I understand that two starts orbiting around a common centre of gravity would be considered co-orbiting, but given that the sun and planets ordit the "wobble" point / common centre of gravity, would the solar system also be considered co-orbiting? Would the Milkyway (the blackhole at the centre and the stars that ordit it (both close in, speeding around the blackhole, and further out like the sun) be considered a co-orbiting system? Thanking you in anticipation. Regards, Noel.