Share & discuss informative content on: Astrophysics, Cosmology, Space Exploration, Planetary Science and Astrobiology.
The Busy Center of the Lagoon Nebula
π Science
π Engineering
π Art and Photography
Other Cool Links
This model combines two ideasβabout how the forces of nature decrease over cosmic time and about light losing energy when it travels a long distance. It's been tested and has been shown to match up with several observations, such as about how galaxies are spread out and how light from the early universe has evolved.
These hypotheses never seem to stand up to rigorous analysis. Still, always welcome the discussion.
Absolutely. On the one hand, having ~26% of the known universe consisting of a substance that we cannot detect directly leaves a lot of questions open. On the other hand; dark matter is postulated because otherwise things like galaxy rotation curves don't match what we believe they should be from general relativity, and this theory doesn't seem to address that.
https://en.wikipedia.org/wiki/Bullet_Cluster#Significance_to_dark_matter
Also, light 'losing energy' would be a violation of the first law of thermodynamics, unless it loses it 'to' somewhere.
Light does actually just lose energy to nowhere in our current understanding of expanding space.
This is the same researcher that said the universe is 26.7 billion years old based on the JWST data instead of 13.8.
Happy to see ideas thrown out there to help us understand what dark matter is, but I'm really looking forward to all the random videos that eventually come out explaining why it holds up against a whole bunch of observational evidence while it ignores all the other observational evidence it doesn't hold up against.
It's time for people to start taking this matter lightly.
Well played.
"In standard cosmology, the accelerated expansion of the universe is said to be caused by dark energy but is in fact due to the weakening forces of nature as it expands, not due to dark energy."
Fascinating! I'm looking forward to seeing where this goes. The "tired light" theory they mention doesn't seem to have held up to scrutiny, but maybe there's something else about weakening over time or distance that we haven't observed yet.
How would the gravitational forces weakening accelerate the expansion speed? It would at best "not slow it down", you can't explain the speed increase with this logic. That just sounds wrong. Am I missing something?
sory i eated it all
where were u wen dark matter die
i was sat at home eating milky way when saturn ring
"dark matter is kill"
"no"
when saturn ring
π₯
Glad someone appreciated that, lol
Just going to assume this popular science article is about a theory with no support as usual.
um i browsed it for nearly two minutes and at the very top of the page there was clearly a chart. i didn't understand it but obviously we can conclude that it is based on scientific science
I have also seen the picture and can confirm, that it is, in fact, a picture.
*hypothesis. A theory (in the scientific sense) has to be tested and therefore has at least some support!
Fair.
Always has been.
Don't get too excited, this is a pretty fringe theory that doesn't really have experimental evidence. They were able to make some observations fit with their theory without dark matter yes, but not all of them. The tired light part in particular has a lot of contradictions with observation that they don't explain.
So interesting, but far from definitive.
Couldn't the same be said for the proof of dark matter?
They were able to make some observations fit with their theory with dark matter yes, but not all of them
Generally for a new theory to be accepted, it needs to explain everything that the old theory did plus something more
Couldnβt the same be said for the proof of dark matter?
No, dark matter is actually a great explanation for lots and lots of observations; the only problem with it is that we don't know anything about it other than that it is such a good explanation for these observations.
If light got tired, wouldn't everything get blurry the further away it were?
I'm nearsighted, so that happens anyways
Me too but I always knew that it was my eyes not the maximum draw distance of the universe that was to blame.
I'm a workshop kind of guy that enjoys space documentaries. For my part, I see "dark matter" as a known hole in our current understanding of cosmology, and I bet when we figure out how it does actually work it'll lead to some really cool TV shows.
This stuff is way, way over my head. And probably most of humanity right now. In this moment I can feel some envy and admiration towards whoever is around to understand the great breakthroughs we may one day have on this matter.
Coles notes: scientists made calculations on the universe and it didn't make sense because the math says there should be more mass and energy than what they know exists. So they called the missing mass dark matter and the missing energy, dark energy.
Now some guy in Ottawa figured out better math that doesn't need the "dark" stuff to make the math make sense.
My understanding of dark energy is a little different. As I understand it, we figured gravity pulls things together, right? So everything should be kinda slowly falling back together from the big bang. It was theorized to end in a 'big crunch' where the universe collapses back and then explodes again in a cycle.
Only when they tried to measure how fast distant objects were moving relative to us, they found that things were still moving away from each other. More than that, the farther away things were, the faster they were moving. Meaning distant objects were accelerating.
Acceleration requires energy, but we don't know the mechanism behind this, or where the energy comes from. Hence, dark energy.
Just to be clear, there are lots and lots of different observations that are all explained by dark matter; it's not just a single term in "the math". Furthermore, the hypothesis presented in this article is not "better math" because it does not do as good a job as dark matter in explaining all of these observations.
Only white matter is allowed in this universe.
I went and read the research.
I'm not an expert and as such can't really analyze it fully. But what I took away is that it aimed to test a part of new theory by with a very narrow measurement, using early-universe density oscillations. They left dark matter out of the equation with the new model, and it was a smashing success if you're willing to overlook that it requires the universe to be a completely different age than it is.. In short, this is shenanigans.
edit: I'm fine being wrong if I am, I'd love to know more from informed readers. That's just what I took away https://iopscience.iop.org/article/10.3847/1538-4357/ad1bc6#apjad1bc6s3
edit2: It also presumes the "tired light theory" is true. Tired light is the flat earth of astrophysics/cosmology. Yeah, there are contrarian knuckleheads in every discipline.
Dark mind over dark matter, amirite?
seems like a good spot for the dark matter rap https://www.astronomy.ohio-state.edu/weinberg.21/Rap/darkmatterrap.mp3
