A question about the universe??

[majornature]

Okay. i know that our universe is expanding and cooling as it accelerates. <br />Here's my question: If the universe is cooling as it accelerates, wouldn't the universe slow down? <br /><br />I thought heat expands and cooling retracts. There has be some heat source involve in the expansion. could it? <div class="Discussion_UserSignature"> <font size="2" color="#14ea50"><strong><font size="1">We are born.  We live.  We experiment.  We rot.  We die.  and the whole process starts all over again!  Imagine That!</font><br /><br /><br /><img id="6e5c6b4c-0657-47dd-9476-1fbb47938264" style="width:176px;height:247px" src="http://sitelife.space.com/ver1.0/Content/images/store/14/4/6e5c6b4c-0657-47dd-9476-1fbb47938264.Large.jpg" alt="blog post photo" width="276" height="440" /><br /></strong></font> </div>

 

[search]

What we know is that the universe is expanding and cooling down. Another thing we know is that it seems to be accelerating.<br /><br />So there is no doubt about the universe temperature progress. <br /><br />The universe appears to be expanding at an accelerating rate. <br /><br />Why do we think that the expansion of the Universe is accelerating?<br /><br />This is inferred because distant supernovae are unexpectedly dim. This is interpreted as implying that the expansion of the universe is faster now than it was before. <br /><br />From:<br />http://www.astro.ucla.edu/~wright/cosmology_faq.html#CC<br /><br />This expansion is in turn explained by some mysterious repulsive force that is pushing the universe apart. The evidence for an accelerating expansion comes from observations of the brightness of distant supernovae. We observe the redshift of a supernova which tells us by what the factor the Universe has expanded since the supernova exploded. This factor is (1+z), where z is the redshift. But in order to determine the expected brightness of the supernova, we need to know its distance now. If the expansion of the Universe is accelerating due to a cosmological constant, then the expansion was slower in the past, and thus the time required to expand by a given factor is longer, and the distance NOW is larger. But if the expansion is decelerating, it was faster in the past and the distance NOW is smaller. Thus for an accelerating expansion the supernovae at high redshifts will appear to be fainter than they would for a decelerating expansion because their current distances are larger. Note that these distances are all proportional to the age of the Universe [or 1/Ho], but this dependence cancels out when the brightness of a nearby supernova at z close to 0.1 is compared to a distant supernova with z close to 1.<br /><br />From:<br />http://www.nap.edu/readingroom/books/cosm</safety_wrapper

 

[majornature]

Thanks a lot!! This was really helpful!!!<br /><br />True Knowledge Discovers... <div class="Discussion_UserSignature"> <font size="2" color="#14ea50"><strong><font size="1">We are born.  We live.  We experiment.  We rot.  We die.  and the whole process starts all over again!  Imagine That!</font><br /><br /><br /><img id="6e5c6b4c-0657-47dd-9476-1fbb47938264" style="width:176px;height:247px" src="http://sitelife.space.com/ver1.0/Content/images/store/14/4/6e5c6b4c-0657-47dd-9476-1fbb47938264.Large.jpg" alt="blog post photo" width="276" height="440" /><br /></strong></font> </div>

 

[newtonian]

majornature - Well, to add to SEARCH's excellent scientific evidence and questions:<br /><br />Search questioned whether our universe is a closed system. Me also. Isaiah 40:22,26 indicate God is stretching out our universe, and v.26 links plural forms of God's energy (Hebrew plural ohnim) with the existence of stars.<br /><br />We know the existence of stars is due to a very finely tuned expansion rate, not to mention very finely tuned forces of physics.<br /><br />There may be other plural forms of energy.<br /><br />And some dark energy may be being added either directly or indirectly by God - such that our universe may not be a totally closed system thermodynamically.<br /><br />In other words, the heat source may not just be from the source of the big bang, but also still being added.<br /><br />Or, alternately, dark energy may be involved in some intrinsic properties of space, or of matter, or of dark matter - etc.<br /><br />This is an exciting time for astronomy as additional data pours in and we narrow down the possible answers in search of truths.<br /><br />I might add that our universe may already be interacting with another universe beyond our visibility horizon such that the distant future may not be as cold as envisioned by those who consider our universe to be eternally a closed system thermodynamically speaking.<br /><br />Astronomer Loeb, somewhere on SDC, postulated the latter scenario, btw.

 

[newtonian]

SEARCH - Excellent post and questions.<br /><br />In the list of possible reasons for acceleration, I will add another:<br /><br />(Isaiah 40:22) . . .There is One who is dwelling above the circle of the earth, the dwellers in which are as grasshoppers, the One who is stretching out the heavens just as a fine gauze,. . .<br /><br />The context, specifically verse 26, links plural (Hebrew ohnim) forms of God's energy with the existence of stars.<br /><br />I suspect that dark energy could be one of those plural forms of energy.<br /><br />It is noteworthy that this ancient statement is in harmony with the most recent scientific data about the expansion of our universe - specifically as observations plus computer modeling do show our universe is like a stretching out fine gauze, complete with threads and filaments!<br /><br />Note, I am linking to your excellent post in another thread now.