<p>We could not have formed "outside" the expanding universe, as there would not be any substance to form our galaxy, and solar system -including our Sun and planet.</p>

CC BY-SA 3.0
2014-04-14T21:58:41.143Z
Ok got it. This makes perfect sense but now I have to ask how do we know where we formed in this plasma? If we formed away from the center, then we would not expect uniform distribution of background radiation. Can someone help me out?
user3138766
CC BY-SA 3.0
2014-04-14T22:00:50.230Z
And I wasn't saying that we could've formed outside if the expanding universe but rather outside of the plasma. The universe now is much large than it was filled with plasma, so the new space from the expansion was in fact outside of the plasma.
user3138766
CC BY-SA 3.0
2014-04-15T14:15:33.983Z
@user3138766 There is no center: http://astronomy.stackexchange.com/questions/669/what-is-in-the-center-of-the-universe
called2voyage
CC BY-SA 3.0
2014-04-15T14:16:35.807Z
@user3138766 The plasma was evenly distributed throughout the early universe. There was no "outside of the plasma".
called2voyage
CC BY-SA 3.0
2014-04-14T19:51:34.927Z
2014-04-14T19:51:34.927Z
Jeremy
<p>If the big bang is true, after the emission of light from the hydrogen plasma, the universe was still expanding. Why would we expect to see uniform radiation if earth very well could have formed outside of this hydrogen plasma. Then we would expect to see bits of background radiation coming from one direction. People sometimes answer this question by saying that the big bang happened everywhere and that where the earth is right now was a haze of hydrogen plasma 13.7 billion years ago. I do not see how one can assume this as since the universe expands we could have formed outside of the plasma and therefore should not expect to detect uniform background radiation. </p>

<cosmology><cosmic-microwave-background>
Cosmic microwave background radiation
user3138766
# Cosmic microwave background radiation

(Asked by: username_0 on 2014-04-14)

If the big bang is true, after the emission of light from the hydrogen plasma, the universe was still expanding. Why would we expect to see uniform radiation if earth very well could have formed outside of this hydrogen plasma. Then we would expect to see bits of background radiation coming from one direction. People sometimes answer this question by saying that the big bang happened everywhere and that where the earth is right now was a haze of hydrogen plasma 13.7 billion years ago. I do not see how one can assume this as since the universe expands we could have formed outside of the plasma and therefore should not expect to detect uniform background radiation.

**Tags:** cosmology, cosmic-microwave-background


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## 1 answers

### Answer by username_1 on 2014-04-14. Score: 2

We could not have formed "outside" the expanding universe, as there would not be any substance to form our galaxy, and solar system -including our Sun and planet.

> **Comments:**
> **username_0**: Ok got it. This makes perfect sense but now I have to ask how do we know where we formed in this plasma? If we formed away from the center, then we would not expect uniform distribution of background radiation. Can someone help me out?  
> **username_0**: And I wasn't saying that we could've formed outside if the expanding universe but rather outside of the plasma. The universe now is much large than it was filled with plasma, so the new space from the expansion was in fact outside of the plasma.  
> **username_2**: @username_0 There is no center: http://astronomy.stackexchange.com/questions/669/what-is-in-the-center-of-the-universe  
> **username_2**: @username_0 The plasma was evenly distributed throughout the early universe. There was no "outside of the plasma".  

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