Interesting article, thanks! I'm not a fan of the spaceship theory, it sounds fast but is ridiculously slow for getting anywhere in galactic distances. However I am interested that the object has no lateral spin? Or does it? Do we know? How is it possible that it doesn't? Even with near perfect ejection any slight impact at that time or after should have caused it to be spinning, not like a bullet but like thrown stick.

Oh and on the subject of tidal forces; I have long harboured the suspicion that sci fi renditions of worlds with vast planetary or solar spheres looming on their horizons would actually be catastrophically geologically unstable due to the tidal forces caused by a planet close enough to be taking up a significant chunk of the sky. My guess is that anything in the sky of a planet that appeared much bigger than our moon or sun would bode poorly for conditions that would support life on the surface. Has anyone done the math on this?