Avalon wrote: ↑
Wed Jun 17, 2020 4:34 pm
johnnydeep wrote: ↑
Wed Jun 17, 2020 2:06 pm
That youtuber sure produces a lot of videos! I watch him occasionally. In this video he talks about a 1% preference for galaxies spinning either clockwise or counterclockwise depending on direction. But as for the entire universe spinning, I'm not sure what that means. If we use the 2-D universe on the surface of a 3-D balloon analogy, how would the spinning be done? You could pick a 3-D spin axis through the center of the balloon, but that would mean that two places in the 2-D surface would be the "poles". Is that really what's being considered?
Wouldn't all spinning objects be spinning "clockwise" or "counterclockwise" depending on whether you're viewing it from "above" or "below"?
Second question, is there a way to see in which direction these magnetic streamlines are flowing?
Yes, the spin depends on orientation of the observer, but for our perspective, it was found that there are statistically significant variations in how many galaxies spin clockwise compared to how many spin counterclockwise depending on the direction we look, when, base on pure chance, we would expect there to be no difference.
As for your second question, I don't know. Do magnetic field lines actually flow? Particles following them can of course, and the magnetic field lines can fluctuate geometrically depending on what's happening to their source, but the field lines themselves don't flow (other than travelling at the speed of light I suppose). But maybe you were
simply talking about the dust following the field lines, in which case you might be able to detect doppler shifts of the emissions of the dust particles and thereby determine movement. And now that I think about it, I'm not sure now what
the color differences in the original APOD image actually represent. All we can ever
see are spectra from anything
we look at, so it would seem that shifted spectra is already what's being shown as color differences.