Does it need to be that the whole universe started with rotation, or that our visible part of the universe has a common ancestor?
James Webb Space Telescope reveals that most galaxies rotate clockwise
31–40 of 318 posts
Re: James Webb Space Telescope reveals that most galaxies rotate clockwise
#32Clockwise relative to what? Does the universe have an "upwards" direction? Or is it just relative to all the other galaxies?
Clockwise relative to our viewpoint, while we would expect that we'd see an equal number rotating in either direction no matter which way we looked or where we were looking from.
How does that follow?
I imagine there was already a preferred spin of gases immediately after the big bang, just due to random chance, so why wouldn’t that be preserved more or less?
Re: James Webb Space Telescope reveals that most galaxies rotate clockwise
#33If we were on the other side of those galaxies, wouldn't they look like they were spinning counter-clockwise? Or are they measuring spin some other way?
The point is that you’d expect a roughly even distribution of clockwise and counterclockwise spins, not all of them to rotate in the same direction.
wouldn't it be the case that you would see almost exactly 50/50 if all galaxies had parallel axes and rotated in the same absolute direction?
Re: James Webb Space Telescope reveals that most galaxies rotate clockwise
#34Earlier quoted context omitted.
I don't understand how the 1e-16 Hz rotation of the Milky Way affects how we perceive other spiral galaxies' orientations.
>Due to an effect called the Doppler shift, astronomers expect galaxies rotating opposite to the Milky Way’s motion to appear brighter, which could explain their overrepresentation in telescopic surveys. I found this a little surprising as well
- "Doppler shift, astronomers expect galaxies rotating opposite to the Milky Way’s motion to appear brighter"
But how does that work?
Re: James Webb Space Telescope reveals that most galaxies rotate clockwise
#35Seems like we've got a few of these imbalances now where you'd expect 50:50 but instead it's skewed to one side where nature had a different idea
Matter-antimatter ratio
Left vs right handed molecules
Now galaxy spin directions
Maybe there are others I missed too
Re: James Webb Space Telescope reveals that most galaxies rotate clockwise
#36Earlier quoted context omitted.
Clockwise relative to our viewpoint, while we would expect that we'd see an equal number rotating in either direction no matter which way we looked or where we were looking from.
How does that follow? I imagine there was already a preferred spin of gases immediately after the big bang, just due to random chance, so why wouldn’t that be preserved more or less?
That's the thing, we don't know any reason for a preferred spin and assumed it would be equally distributed. So this is an interesting fact.
Re: James Webb Space Telescope reveals that most galaxies rotate clockwise
#37If we were on the other side of those galaxies, wouldn't they look like they were spinning counter-clockwise? Or are they measuring spin some other way?
The point is that you’d expect a roughly even distribution of clockwise and counterclockwise spins, not all of them to rotate in the same direction.
why? if you subscribe to big bang then all matter got the same "initial kick". would be easier to assume same spin?
Re: James Webb Space Telescope reveals that most galaxies rotate clockwise
#38> Due to an effect called the Doppler shift, astronomers expect galaxies rotating opposite to the Milky Way’s motion to appear brighter How does this work? The page it links to doesn't explain why rotation would matter. Edit: To clarify - one side of the galaxy would be moving towards us, and one away from us, no matter which direction it spins in, so this should not affect the average brightness of the entire galaxy…
One side is moving away from us, the other towards. This means their relative speeds are different, detectably so.
I went to give a similar answer and realized that - in the instance that the two galaxies are sideways facing each other and with the text saying “it gets brighter” not “one side gets brighter” - I’m not sure if this is the actual answer.
I can’t figure out why the Doppler Shift would make the entire galaxy brighter. I assumed it would make the rotation side spinning towards us brighter. But also redshift the side spinning away.
Re: James Webb Space Telescope reveals that most galaxies rotate clockwise
#39Seems like we've got a few of these imbalances now where you'd expect 50:50 but instead it's skewed to one side where nature had a different idea Matter-antimatter ratio Left vs right handed molecules Now galaxy spin directions Maybe there are others I missed too
Cosmic Rays May Explain Life’s Bias for Right-Handed DNA
"the rapid decay of pions is governed by the weak force — the only fundamental force with a known mirror asymmetry"
https://www.quantamagazine.org/cosmic-rays-may-explain-lifes...
Re: James Webb Space Telescope reveals that most galaxies rotate clockwise
#40Seems like we've got a few of these imbalances now where you'd expect 50:50 but instead it's skewed to one side where nature had a different idea Matter-antimatter ratio Left vs right handed molecules Now galaxy spin directions Maybe there are others I missed too
Isn’t there a different observation for why planets tend to orbit in the same direction in a solar system?