(December 16, 2017 at 9:38 pm)Jehanne Wrote: It would still be unusual, to say the least, to encounter any such object at the galactic apogee of its orbit, unless, of course, there were a lot of such objects. Conservation of angular momentum vs-a-vie destiny wave theory (spiral arms and all) at least implies that most of the mass of our Galaxy (excluding the core) traverses the Milky Way in mostly circular orbits, and most of that activity (excluding global clusters, of course) is confined to the disc of our Galaxy.
That’s probably right. But much of the stars that do orbit the Milky Way out of plane or in odd or retrograde orbits may come not from globular clusters, but stripped from other galaxies cannibalizes by the Milky Way.
This creates the possibility that any interstellar object that enter the solar system with abnormally high initial velocity is not just extrasolar, but has a significant probability of being extragalactic in origin.
