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Message boards : Cosmology and Astronomy : Featured Concept: Dark Matter

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Shahidur Rahman Sikder
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Message 12396 - Posted: 27 Jan 2013, 20:12:54 UTC - in response to Message 10809.

See Universe Figure at http://bit.ly/cyOPwq lastly we can take decision- that our universe is early or copy i.e. Digital Universe. See- at http://t.co/nsND5lSm finds out a DEMO Brief History of the Universe, and you can see- Structure of Sketch of the Universe
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Profile abmehta
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Message 13340 - Posted: 14 Sep 2013, 9:47:55 UTC

Since the time taken to get data varies according to the distance, do I understand that data about clusters is of varying period and very old and may be totally different at this moment?

Profile GEOFF RODLEY
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Message 13377 - Posted: 29 Sep 2013, 20:52:47 UTC

Hello one and all ,
My question to you folk : Has anyone ever suggested that dark matter may have been around since before the creation of our Universe in the big bang .
Could it be feasible that dark matter was the pre-universe medium into which the universe expanded , or perhaps our nascent Universe was `pulled` into this dark matter medium . I would love to hear what anybody thinks about this ; someone who can put this scientific layman on the right track .
Wherever you are , have a good one .
Geoff .

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Profile Faik
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Message 13433 - Posted: 15 Oct 2013, 3:36:30 UTC - in response to Message 13377.

---Has anyone ever suggested that dark matter may have been around since before the creation of our Universe in the big bang

Not in the context of standard Big Bang cosmology. Because according to the standard Big Bang model, the universe as we known it and understand it today came into existence with the big bang. This includes space and time. Therefore, it would not make much sense to speak of dark matter being there "before" the "creation of our universe".

I hope this helps!

Faik
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JonathanArcher
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Message 13714 - Posted: 8 Jan 2014, 12:47:43 UTC

In pratica è come chiedere a una scimmia di spiegare e dimostrare cos'è
l'aria che respira? Quindi la nostra tecnologia non ci permette di spiegarla
giusto?

Bill Canaday
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Message 20167 - Posted: 24 Nov 2014, 16:14:56 UTC

It would seem that the energy of the universe, although staggering, is finite. If it is infinite, then so is its appetite for matter ... and that cannot end well.

Does this mean that, if there is not enough dark matter to cause it to collapse inward, the available energy would at some point be insufficient for life or, for that matter, even molecular motion?

If there is enough matter (dark + luminous) to cause that collapse into a new singularity and a repeat of the big bang, would that cyclic process eventually bleed off enough energy to not be able to repeat?

If it did, where would the energy go and what would it do once it got there?

What are the relative chances that the process would end at the point of the singularity vs ending in an unfettered and eternal expansion? Or might it end in both, with some of the matter falling inward (but not enough for another big bang) and the rest drifting forever outward, unable to coalesce or, having coalesced into a blob here and a blob there, drift forever outward into -- what?

--------

Barring personal reading (on the layman level), my most recent science class was in 1970. Please forgive me if I have not kept up with current events in the cosmos.

Bill

Profile cykodennis
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Message 20168 - Posted: 24 Nov 2014, 22:58:10 UTC - in response to Message 20167.

Actually, there isn't even a hint for a collapsing universe, dark matter or not.
We observe the universe still accelerating. We don't know why it still accelerates.
You can check wikipedia for "Dark Energy"
http://en.wikipedia.org/wiki/Dark_energy

So, from that point of view it seems to not matter how much dark matter exists, because it is obviously not enough to slow the expansion down.
For your further questions, i'm afraid i'm not able to answer them.

Ray Majka
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Message 20335 - Posted: 17 Sep 2015, 20:02:58 UTC
Last modified: 17 Sep 2015, 20:30:39 UTC

Greetings!

To truly understand all things attributed to "Dark Matter", an excellent beginning would be to read "The Emperor's New Clothes" by Hans Christian Andersen... just not convinced yet; but sincerely, Good Luck in your continuing work.

Ray

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Message boards : Cosmology and Astronomy : Featured Concept: Dark Matter