Universe expanding at an accelerating rate?

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21 Oct 2016 21:11 #262223 by Loudzoo
This is interesting . . . if you're into cosmology. A new paper using a data set 10 times larger than the original data set used in the late '90's to 'prove' that the universe is expanding at a an accelerating rate, is much less statistically significant than the original analysis. So the evidence still suggests that the universe is expanding at an accelerating rate but now the collected evidence is less compelling than it previously was.

Article: astronomynow.com/2016/10/21/the-universe...ating-rate-or-is-it/

Paper [for Gisteron ;) ]: www.nature.com/articles/srep35596

Warning: Spoiler! [ Click to expand ]

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19 Mar 2017 17:25 #278661 by Obo Nâm
Replied by Obo Nâm on topic Universe expanding at an accelerating rate?
Interesting article. I like the idea of moving away from the dark energy requirement (not a Star Wars joke!)... it just sits wrong with me and i think we are creating ideas too easily to explain observations that are themselves tenuous... No dark energy and a constant rate of expansion and I'll sleep a lot better! :)

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19 Mar 2017 18:08 #278663 by JLSpinner
I have absolutely disagreed with the accelerated expansion and dark energy theory. The assumptions were too grand from not enough knowledge. We have no real clue as to most of the workings of the universe.

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06 Jan 2018 21:19 #311291 by ThatStarWarsFan
Replied by ThatStarWarsFan on topic Universe expanding at an accelerating rate?
I'm pretty sure that like gravity (which pulls things together) there is expansion, which does the opposite of gravity. I think they are in a constant war with each other, pulling on each other until one wins and the universe rapidly expands or becomes smaller and smaller.

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06 Jan 2018 22:26 #311297 by Thanasis
Replied by Thanasis on topic Universe expanding at an accelerating rate?
There is no gravity in space unless it is by a star or planet.

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06 Jan 2018 22:35 #311299 by Arisaig
Replied by Arisaig on topic Universe expanding at an accelerating rate?

Thanasis wrote: There is no gravity in space unless it is by a star or planet.


Well, that would mean gravity permeates space. Gravity is everywhere. Even those aboard the ISS aren't free of gravity, they're falling constantly, falling faster than gravity's 9.8 meters per second, making them achieve the illusion of floating.

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08 Jan 2018 07:39 - 08 Jan 2018 07:42 #311477 by Adder
I think gravity tends to be just the interaction of energies, the more dense energy having the greater power to influence neighbours, see Hill Sphere and the Interplanetary Transport Network for interesting non-math bits!


Arisaig wrote:

Thanasis wrote: There is no gravity in space unless it is by a star or planet.


Well, that would mean gravity permeates space. Gravity is everywhere. Even those aboard the ISS aren't free of gravity, they're falling constantly, falling faster than gravity's 9.8 meters per second, making them achieve the illusion of floating.


Dunno why they call it falling, as I'd think its more accurate to say its not falling (not going down) - rather just moving fast enough perpendicular to gravity that the gravity has no net effect on its radial distance AFAIK. So I think its taking some liberties with language to associate weightlessness to the phenomena of orbit - but instead just basically meaning the object is still being impacted by the gravity field :D
Else they might as well be saying anything influenced by gravity is falling, in which case being flung out by gravity could be 'falling away' I guess :S

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Last edit: 08 Jan 2018 07:42 by Adder.

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08 Jan 2018 12:32 - 08 Jan 2018 12:44 #311485 by Lykeios
Interesting information. Thanks for sharing this, Loudzoo!

On the subject of gravity, I recently started reading an interesting book about dark matter and how it can influence gravitational fields and potentially interact with ordinary matter through it's gravity. Book is called "Dark Matter and the Dinosaurs" and it was written by Lisa Randall (a physicist) if anyone is interested. I haven't finished the book yet, but I believe her thesis is the theory that dark matter could actually have caused the meteorite shower that killed off the dinosaurs. It's a bold claim, but she backs up her theories with evidence. I love the book because it's written in a way I can understand as a layman and yet doesn't pull any punches when it comes to complex concepts and scientific discoveries.

EDIT: Just read the little section she wrote about this very topic...haha. She wrote the book prior to this new information, so she's operating under the premise that the universe's expansion rate is accelerating.

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Last edit: 08 Jan 2018 12:44 by Lykeios.

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08 Jan 2018 13:28 #311489 by Flojade
Vert interesting! The universe is still going towards the big freeze though is it not?

Flojade

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