<p>This is the classic misconception about the expansion of the Universe: <strong>there is no center of the Universe</strong>. The whole universe expands as one, <strong>not from a single point nowhere</strong>.</p>

<p>Knowing this it makes no sense speaking of the direction of an object due to the Universe. You could compare the directions of two objects in it though.</p>

<p>Therefore star's direction depend on where and how they where created and also the interaction with other stars and their home galaxy.</p>

CC BY-SA 3.0
2015-02-17T12:18:38.847Z
How does this relate to the Big Bang - didn't the Big Bang happen in the center of the Universe? Thanks
Vladi
CC BY-SA 3.0
2015-02-17T12:25:58.903Z
One more thing - how the expansion of the Universe reflects on the speed of the Stars and Galaxies?
Vladi
CC BY-SA 3.0
2015-02-17T12:32:37.333Z
That's the point: the Big Bang wasn't an explosion IN the universe, it was actually the Universe that went from being infinitesimally small to expand as we know it today. This expansion rate is the 'acceleration' you are looking for and it is known as the Hubble Law http://en.wikipedia.org/wiki/Hubble%27s_law But this is not the only 'acceleration' applied to objects in the Universe, the interactions between them are more significant.
Joan.bdm
CC BY-SA 3.0
2015-02-17T15:28:46.180Z
Earth does, however have some drift relative to the cosmic microwave background radiation; about 600 kilometers per second: http://apod.nasa.gov/apod/ap140615.html
Wayfaring Stranger
CC BY-SA 3.0
2015-02-17T12:12:18.960Z
2015-02-17T12:12:18.960Z
Joan.bdm
<p>I have read quite different opinions about that, so can someone tell me what is the sign of the acceleration of the stars in the Universe if we accept that the center of the Universe is the beginning of the coordinate system? At least what is considered as correct finally :)</p>

CC BY-SA 3.0
2015-02-18T15:07:32.190Z
what center of the universe?
Yukterez
<star><universe><speed>
What is the acceleration of the stars' speed in the Universe? Positive or negative?
Vladi
# What is the acceleration of the stars' speed in the Universe? Positive or negative?

(Asked by: username_0 on 2015-02-17)

I have read quite different opinions about that, so can someone tell me what is the sign of the acceleration of the stars in the Universe if we accept that the center of the Universe is the beginning of the coordinate system? At least what is considered as correct finally :)

**Tags:** star, universe, speed
> **Comments:**
> **username_1**: what center of the universe?  

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## 1 answers

### Answer by username_2 on 2015-02-17. Score: 2 | Accepted answer

This is the classic misconception about the expansion of the Universe: **there is no center of the Universe**. The whole universe expands as one, **not from a single point nowhere**.

Knowing this it makes no sense speaking of the direction of an object due to the Universe. You could compare the directions of two objects in it though.

Therefore star's direction depend on where and how they where created and also the interaction with other stars and their home galaxy.

> **Comments:**
> **username_0**: How does this relate to the Big Bang - didn't the Big Bang happen in the center of the Universe? Thanks  
> **username_0**: One more thing - how the expansion of the Universe reflects on the speed of the Stars and Galaxies?  
> **username_2**: That's the point: the Big Bang wasn't an explosion IN the universe, it was actually the Universe that went from being infinitesimally small to expand as we know it today. This expansion rate is the 'acceleration' you are looking for and it is known as the Hubble Law http://en.wikipedia.org/wiki/Hubble%27s_law But this is not the only 'acceleration' applied to objects in the Universe, the interactions between them are more significant.  
> **username_3**: Earth does, however have some drift relative to the cosmic microwave background radiation; about 600 kilometers per second: http://apod.nasa.gov/apod/ap140615.html  

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