131–140 of 318 posts
Complete layman's question: If we would indeed be inside a black hole wouldn't we be able to observe new energy and matter entering? Related question: the horizon of a black hole is expanding when the mass increases. Could this map to the expansion of our universe, which seems to expand faster and faster?
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Yes, but one half of a galaxy would get redshifted, and the other blueshifted, no matter which direction it spins in. So why would that change its overall brightness? (Though one of the papers notes that the tiny change in brightness this causes isn't enough to explain the large difference in spin directions)
The close and far sides get shifted too, and those have different brightness.
Whatever asymmetry you're visualizing for one galaxy, its mirror-image galaxy is equally physical, and possesses the same asymmetry.
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If all of the galaxies we see rotate the same way, are we “looking down” from a pole and seeing only those with the same rotation we have, as opposed to a more equatorial view that would be evenly split.
But the universe isn’t spherical. I’m not sure I understand this hypothesis as explained.
Seems 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
I honestly start thinking that the idea "everything should be symmetric in some way..." is completely wrong, and an example of wishful thinking "...because it would be cool if it did". Even if nature is in some way balanced on a scale large enough, it's extremely unlikely for us not to be in some local pocket. Most likely we're a part of some bigger structure that has certain properties, and this affects our percepti…
Which would also be the reason we have the laws of physics we do in general.
Anything seemingly ad hoc in our universal (from our vantage) viewpoint is potentially explainable as a pocket among all other possible distributions/combinations of relations.
Earlier quoted context omitted.
If all of the galaxies we see rotate the same way, are we “looking down” from a pole and seeing only those with the same rotation we have, as opposed to a more equatorial view that would be evenly split.
But the universe isn’t spherical. I’m not sure I understand this hypothesis as explained.
Earlier quoted context omitted.
If all of the galaxies we see rotate the same way, are we “looking down” from a pole and seeing only those with the same rotation we have, as opposed to a more equatorial view that would be evenly split.
But the universe isn’t spherical. I’m not sure I understand this hypothesis as explained.
> 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…
I think this may be a subtle reference to what is usually called "relativistic beaming" or "Doppler beaming" [0], though I normally associate this effect with matter that is moving quite close to the speed of light. [0]: https://en.wikipedia.org/wiki/Relativistic_beaming
The other question is - what does the rotation of our own galaxy have to do with it? Let's keep the Solar system as is, and mirror the rest of the Milky Way around it, so that it is now spinning the opposite direction. Why should this affect the apparent brightness of other galaxies? Especially since the Solar system is effectively moving in a straight line, on the scale of a human lifetime.
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The inner black hole did not come from the outside, it formed inside and if i had to guess, it is stuck in the inside together with all the other matter, unable to interact with the outside of the outer black hole.
Just thinking about this infinite recursion gives me the mental equivalent of a stack overflow.
Earlier quoted context omitted.
- "Doppler shift, astronomers expect galaxies rotating opposite to the Milky Way’s motion to appear brighter" But how does that work?
I'm not an astronomer, but my intuition is this: When the source of the light is moving towards the observer, each successive photon emission happens from a position closer to the observer than the previous photon. Hence, from the observer's perspective, the time between photons is reduced, meaning more photons are observed in a given time, and the brightness is increased. When we observe a galaxy that is rotating op…
But between any point in one galaxy to another, just as much matter will be moving closer as moving away. Regardless of same or opposite rotations.
But perhaps greater red shift and greater blue shift (as apposed to lesser of both) as a practical matter of telescopes vs. their cross spectrum sensitivities, means more light detected.