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Posted by instagraham 3/31/2025

James Webb Space Telescope reveals that most galaxies rotate clockwise(www.smithsonianmag.com)
356 points | 310 commentspage 3
metalman 3/31/2025|
must be something left out, because a galaxies r/l rotation is dependent on which side it is bieng viewed from, and since the are unlabled as to face and back, what is the basis for the handedness of something spinning in the void, with presumably most of the galaxies tilted at every angle and orientation possible other than aligned with ours. and 263* galaxies is zero galaxies when divided by the minimum number of galaxies, it's not a significant sample * number in study
wtcactus 3/31/2025||
The linked article is written in an absurd way. Clockwise is not a fundamental measurement, it's relative to the viewer.

What the original article explains, is that this is relative to our observer point of view (obviously).

It's still very interesting, since, disregarding any potential interaction in our local group, randomness was expected and we should see around 50/50 rotating either way unless one of the explanations came into play.

geor9e 3/31/2025||
TIL the universe has a specific "up" direction to even call things counterclockwise. I guess I should have already known this from Star Trek's quadrants https://en.wikipedia.org/wiki/Galactic_coordinate_system
lupusreal 3/31/2025||
Is this a robust finding? I heard something about this apparent discrepancy a week or so ago, and it was dismissed as probably just an artifact of dodgy classification and the paper's author was a bit of a kook, a computer scientist who was delving into cosmology to find evidence of the simulation hypothesis.
singularity2001 3/31/2025||
approximately 60% of the 263 galaxies examined were found to rotate clockwise, while about 40% rotated counterclockwise. The study’s results have a significance level of approximately 3.39 sigma, indicating a moderate chance that the findings could be due to random fluctuations
gwbas1c 3/31/2025||
I used to read a lot about the history of science as a kid.

The one thing that stuck with me is how frequently things we believe to be true are disproven.

This does not surprise me:

> “If that is indeed the case, we will need to re-calibrate our distance measurements for the deep universe,”

kerkeslager 3/31/2025||
Another potentially dumb question: what does it mean for a 3d body to rotate clockwise? Doesn't a clock, viewed from its back, turn counter-clockwise? So is this just from James Webb's perspective that they rotate clockwise?
abecedarius 3/31/2025|
Yeah, the headline is misleading for just that reason. But rotation in 3d does have an unambiguous orientation which we call right-handed or left-handed (the "right hand rule" if you're unfamiliar with this). I don't know which orientation our galaxy's rotation has, the article only says it's opposite the majority in this sample.
BubbleRings 3/31/2025||
I was disappointed that the article only once mentioned “from our perspective” in relation to the spin of galaxies. One of the most fascinating things that you first learn about when you try to understand relativity, is the fact that there is no “still” point in the entire universe. Out in space, the point in space one foot in front of your space suit’s helmet can be called still by you, but it is just as reasonable to call a rock racing by you at a million miles an hour the central still point, where all other motion in the universe can be measured against. Because there is no absolute still anywhere. And when you understand that, that’s when all these cool concepts can then be described, related to time changes that happen between two locations when the relative speed difference between the two objects or locations approaches the speed of light. (So you can return from your trip to Alpha Centuri and meet your great great grandson who is older than you.)

And just like there is no still point in the universe, there is no up or down. So yes, it may be true that, IF you select a couple of arbitrary points in the universe to be up and down, THEN you can count how any galaxies spin left vs right. And it is way cool to find out that it doesn’t appear to be 50/50, and to wonder about why. But I think the article author did the readers a disservice by glossing over the “no up or down” fact.

andrewclunn 3/31/2025||
Time and time again, we are beginning to come to the realization that our entire observable universe is not the whole picture, and we are almost certainly seeing only a localized portion of a much larger and grander universe.
damnitbuilds 3/31/2025|
1. Are they really saying "Because we are in a universe with a preferred spin and black holes have spin, we must be inside a black hole?" Tenuous, no?

2. If we are inside a black hole, where is the singularity?

layer8 3/31/2025||
Inside a black hole just means inside its event horizon. The singularity can still be arbitrarily far away from that horizon (if the black hole is correspondingly large). The volume enclosed by the event horizon may be larger than our cosmological horizon (i.e. how far the speed of light allows us to see, given the finite age of the universe.) And the singularity of a black hole isn’t “where”, it’s “when”. The singularity of a black hole is in the future of all particle trajectories inside the event horizon.
mnky9800n 3/31/2025|||
If the universe is bounded by regions that are further away than the speed of light has time to reach us then that would be an ideal place to look for a singularity. unfortunately it is unmeasurable since so far the speed of light is a hard boundary for what we can measure.
floxy 3/31/2025||
> where is the singularity?

Maybe black holes don't have a singularity:

https://arxiv.org/abs/2312.00841

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