|MadSci Network: Astronomy|
I am curious to know if an object (star or cluster) orbiting perpendicular to the galactic plane (ours or any others) has the same average velocity as stars orbiting within the galactic plane. I think it is possible much of the "dark matter" effect may be due to gravitational lensing within the galactic plane but that object that orbit significantly out of the plane will not experience this and have a slower orbit.
Re: Are there any known objects that orbit perpendicular to the galactic plane?
Try the links in the MadSci Library for more information on Astronomy.