I was wondering the same thing -- "direction of spin" is ambiguous on its own, you also need to pick which direction is up. But if objective spin directions ar

I was wondering the same thing -- "direction of spin" is ambiguous on its own, you also need to pick which direction is up. But if objective spin directions are roughly evenly split because the universe is isotropic, the spins from our viewpoint ought to be evenly split as well. If they're not evenly split, the universe must have a preferred axis, which would be an amazing discovery. I guess if the preferred axis just happens to align with our own galaxy, that would support the alternative theory that it's due to an observation effect such as doppler shift. Either way, it's incredibly cool to have such a simple but totally unexpected observation pop up out of nowhere.