<p>If dark energy varied by location, then plots of 1a supernova brightness vs redshift should vary depending on which direction you look in the sky. AFAIK, that's not the case. For example, although coords are not accounted for, there's not a lot of scatter <a href="http://phys.org/news/2011-10-supernovae-universe-expansion-understood-dark.html">in this plot</a>:</p>

<p><img src="https://i.sstatic.net/F8YhF.jpg" alt="enter image description here"></p>

<blockquote>
  <p>In the relationship between the distance and redshift of Type 1a supernovae, the data (points) agree with the equation in which light propagates through the expanding universe on the least-time path (solid line). Image credit: Annila. ©2011 Royal Astronomical Society</p>
</blockquote>

<p>Read more at: <a href="http://phys.org/news/2011-10-supernovae-universe-expansion-understood-dark.html#jCp">http://phys.org/news/2011-10-supernovae-universe-expansion-understood-dark.html#jCp</a></p>

CC BY-SA 3.0
2015-03-15T18:10:43.077Z
I think you are right, but I don't think that plot tells you much.
ProfRob
CC BY-SA 3.0
2015-03-15T13:21:41.937Z
2015-03-15T13:21:41.937Z
Wayfaring Stranger
<p>Good question but we can only see out a certain distance because of it's expansion. AFAIK acceleration of the universe will eventually reduce the distance we can see over time.</p>

<p>No one knows if the universe is infinitely large, or even if ours is the only universe that exists. And other parts of the universe, very far away, might be quite different from the universe closer to home.  The site <a href="http://skyserver.sdss.org/dr1/en/astro/universe/universe.asp" rel="nofollow">http://skyserver.sdss.org/dr1/en/astro/universe/universe.asp</a> give a good basic picture.</p>

CC BY-SA 3.0
2015-03-16T06:41:57.763Z
I am not familiar with the acronym AFAIK.
Curious Layman
CC BY-SA 3.0
2015-03-17T15:48:34.490Z
@JimmyG. AFAIK = As Far As I Know. At least, as far as *I* know.
HDE 226868
CC BY-SA 3.0
2015-03-17T16:04:27.800Z
@HDE226868  yeah i was going to use the recursive idea to reply to the OP but I thought it was such an terribly bad joke that I gave up.  You have **totally** no scruples in that regard :)   I put it in the answer box by mistake so it got dumped. all the best
irish physics
CC BY-SA 3.0
2015-03-15T18:24:04.033Z
2015-03-15T18:24:04.033Z
irish physics
<p>Are there certain parts of the Universe that are expanding faster than others? Is there anyway to definitively measure this?</p>

<universe><expansion><dark-energy>
Is dark energy evenly spaced throughout Universe?
Curious Layman
# Is dark energy evenly spaced throughout Universe?

(Asked by: username_0 on 2015-03-15)

Are there certain parts of the Universe that are expanding faster than others? Is there anyway to definitively measure this?

**Tags:** universe, expansion, dark-energy


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## 2 answers

### Answer by username_1 on 2015-03-15. Score: 5

If dark energy varied by location, then plots of 1a supernova brightness vs redshift should vary depending on which direction you look in the sky. AFAIK, that's not the case. For example, although coords are not accounted for, there's not a lot of scatter [in this plot](http://phys.org/news/2011-10-supernovae-universe-expansion-understood-dark.html):

![enter image description here](https://i.sstatic.net/F8YhF.jpg)

> In the relationship between the distance and redshift of Type 1a supernovae, the data (points) agree with the equation in which light propagates through the expanding universe on the least-time path (solid line). Image credit: Annila. ©2011 Royal Astronomical Society

Read more at: <http://phys.org/news/2011-10-supernovae-universe-expansion-understood-dark.html#jCp>

> **Comments:**
> **username_2**: I think you are right, but I don't think that plot tells you much.  

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### Answer by username_3 on 2015-03-15. Score: 1

Good question but we can only see out a certain distance because of it's expansion. AFAIK acceleration of the universe will eventually reduce the distance we can see over time.

No one knows if the universe is infinitely large, or even if ours is the only universe that exists. And other parts of the universe, very far away, might be quite different from the universe closer to home. The site <http://skyserver.sdss.org/dr1/en/astro/universe/universe.asp> give a good basic picture.

> **Comments:**
> **username_0**: I am not familiar with the acronym AFAIK.  
> **username_4**: @JimmyG. AFAIK = As Far As I Know. At least, as far as *I* know.  
> **username_3**: @HDE226868  yeah i was going to use the recursive idea to reply to the OP but I thought it was such an terribly bad joke that I gave up.  You have **totally** no scruples in that regard :)   I put it in the answer box by mistake so it got dumped. all the best  

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