“One explanation is that the universe was born rotating. That explanation agrees with theories such as black hole cosmology, which postulates that the entire universe is the interior of a black hole. But if the universe was indeed born rotating, it means that the existing theories about the cosmos are incomplete.”

The article never gets to the second explanation. What am i missing here?

[–] Num10ck@lemmy.world 8 points 2 weeks ago (1 children)

Possible Explanations:

Shamir proposes two main explanations for this unexpected pattern:
- A Rotating Universe: The universe itself might have been born rotating, which could explain the observed asymmetry.
- Observational Bias: Earth's motion around the Milky Way's center might create a Doppler shift effect, making galaxies rotating in the opposite direction appear brighter and more detectable, potentially creating an observational bias.

[–] Peasley@lemmy.world 2 points 2 weeks ago* (last edited 2 weeks ago)

Thanks! The article never mentions the direction of the MW's spin, so the bias section reads pretty roughly. If the reader knows that going in then it makes perfect sense:

MW spins counter-clockwise
Most observed galaxies spin clockwise
Doppler effect would make galaxies spinning the opposite direction of Milky Way appear slightly brighter to us,

which suggests observation bias as a possible explanation. I only got 2/3.

A strategic "also" in "This could explain why such galaxies seem more common in telescope observations." would have helped as well.

[–] SpicyLizards@reddthat.com 6 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

If we are counterclockwise and things going on... we are the evil mirror galaxy

[–] Peasley@lemmy.world 2 points 2 weeks ago

That or we are looking at things upside-down