What does 'now' mean here?
Recent years, probably because of large data centers /s
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Analysis indicates that the universe’s expansion is not accelerating
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Re: Analysis indicates that the universe’s expansion is not accelerating
#12Was there a date at the top of this? I didn't see one. I saw a similar headlines earlier this year and I'm trying to understand that this is something new
the linked journal article is dated Nov 6 2025
Re: Analysis indicates that the universe’s expansion is not accelerating
#13Thanks, AI.
Re: Analysis indicates that the universe’s expansion is not accelerating
#14Aside from unanswerable questions (has the universe started to fill it's container? Is a simulation property nearing "1"?), does this make long distance space travel feasible again? I thought there was something around the universe is expanding too fast to visit places like Alpha Centuri (and preventing visitors to us).
That limitation only counts for visiting other galaxies. Travel within the galaxy is always possible, regardless of the universe’s expansion. And Alpha Centauri is super close, even within our galaxy.
Specifically the local group, so Milky way + Andromeda and some dwarf galaxies
Re: Analysis indicates that the universe’s expansion is not accelerating
#15Anyone know how credible this is? If true, then that means the big bounce is back on the menu, and the universe could actually be an infinitely oscillating system.
Re: Analysis indicates that the universe’s expansion is not accelerating
#16Aside from unanswerable questions (has the universe started to fill it's container? Is a simulation property nearing "1"?), does this make long distance space travel feasible again? I thought there was something around the universe is expanding too fast to visit places like Alpha Centuri (and preventing visitors to us).
Edit: A big brain fart, ignore the retracted part below. Colonizing the universe is of course impossible in 100My, barring FTL. What the paper I referred to [1] says is that colonizing the Milky Way may take less than that, and if you can do that, spreading to the rest of the observable universe is fairly easy, very relatively speaking.
According to some calculations, it should in principle be possible to colonize the entire observable universe in less than a hundred million years. It's much too fast for the expansion to affect except marginally.
The relative jump in difficulty from interstellar to intergalactic is much smaller than from interplanetary to interstellar.
Anyway, as others said, mere intragalactic (and intra-Local Group) travel is not affected by expansion in any way whatsoever.
[1] https://www.sciencedirect.com/science/article/abs/pii/S00945..., PDF at https://www.aleph.se/papers/Spamming%20the%20universe.pdf
Re: Analysis indicates that the universe’s expansion is not accelerating
#17Anyone know how credible this is? If true, then that means the big bounce is back on the menu, and the universe could actually be an infinitely oscillating system.
At least The Guardian has a comment from an independent expert:
"Prof Carlos Frenk, a cosmologist at the University of Durham, who was not involved in the latest work, said the findings were worthy of attention. “It’s definitely interesting. It’s very provocative. It may well be wrong,” he said. “It’s not something that you can dismiss. They’ve put out a paper with tantalising results with very profound conclusions.”"
https://www.theguardian.com/science/2025/nov/06/universe-exp...
Re: Analysis indicates that the universe’s expansion is not accelerating
#18What does 'now' mean here?
Going by the second graph, since about 2.5 billion years ago.
Re: Analysis indicates that the universe’s expansion is not accelerating
#19Was there a date at the top of this? I didn't see one. I saw a similar headlines earlier this year and I'm trying to understand that this is something new
>>>Submitted by Sam Tonkin on Thu, 06/11/2025
At the very bottom. Weird how style guides keep putting important information like this in harder to reach places.
Re: Analysis indicates that the universe’s expansion is not accelerating
#20Anyone know how credible this is? If true, then that means the big bounce is back on the menu, and the universe could actually be an infinitely oscillating system.
At least The Guardian has a comment from an independent expert: "Prof Carlos Frenk, a cosmologist at the University of Durham, who was not involved in the latest work, said the findings were worthy of attention. “It’s definitely interesting. It’s very provocative. It may well be wrong,” he said. “It’s not something that you can dismiss. They’ve put out a paper with tantalising results with very profound conclusions.”…
As an academic, that is exactly what the kind of noncommittal, don’t burn your bridges with colleagues and funding bodies thing that I would say about even clearly flawed research if I were put on the spot by a popular-press publication. In fact, if you know you can rebut flawed research in time, you might want to assist in hyping it first so that your rebuttal will then make a bigger splash and benefit your personal brand.