Dark Energy Question

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  • Member since
    October, 2013
Posted by Tony383 on Wednesday, October 30, 2013 5:46 PM

Thanks to both of you.  Strange concepts for sure!

"The problem with quotes on the internet is that it is hard to determine whether they are genuine"  Abraham Lincoln

Dobsonian, 72mm Astro-Tech ED refractor, a bunch of eyepieces, a couple of filters, a DSLR and german equatorial mount, binoculars

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Posted by DaveMitsky on Wednesday, October 30, 2013 1:59 PM

On the local level, gravity is strong enough to counter cosmological expansion.  One possibility, assuming that dark energy exists, is that as the universe continues to expand, the influence of gravity will be "diluted" to the point that dark energy will begin to affect matter itself and not just space-time, eventually resulting in a so-called Big Rip scenario, where all matter is disassociated by "phantom energy".

http://www.pbs.org/wgbh/nova/physics/blog/2012/08/the-phantom-energy-menace-is-the-cosmos-doomed-to-a-big-rip/

http://www.newscientist.com/article/dn3461-phantom-menace-may-rip-up-cosmos.html#.UnFaBfmsjTo

http://hetdex.org/dark_energy/dark_matter.php

http://www.aip.org/pnu/2003/split/651-1.html

http://www.aip.org/png/2003/200.htm

Dave Mitsky

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

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  • From: Texas
Posted by chipdatajeffB on Wednesday, October 30, 2013 7:10 AM

That is, indeed, the way it seems to work. We don't know why.

There are mathematical computer simulations that model the effects of dark energy very well, given some assumptions based on observations. These may lead the way to eventual understanding. But for now that seems to be the best we have.

The universe is not only stranger than we imagine, it's stranger than we CAN imagine. --- JBS Haldane

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  • Member since
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Dark Energy Question
Posted by Tony383 on Tuesday, October 29, 2013 9:36 PM

I was talking about dark energy with another amateur astronomer, and I had what seems to be a relatively simple question.  If the universe is not only expanding, but in fact accelerating in its expansion, wouldn't we feel the effect of the acceleration?  He said it doesn't work on a local level.  This doesn't make sense to me.  Am I missing something here?  

"The problem with quotes on the internet is that it is hard to determine whether they are genuine"  Abraham Lincoln

Dobsonian, 72mm Astro-Tech ED refractor, a bunch of eyepieces, a couple of filters, a DSLR and german equatorial mount, binoculars

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