<p>hydrogen is the most common element in the universe, Oxygen is the third most common element in the universe, hydrogen + oxygen + heat/energy = water. Water is literally the most common compound in the universe.</p>

CC BY-SA 3.0
2017-03-21T15:45:54.707Z
2017-03-21T15:45:54.707Z
John
<p>We all know that the water on Earth came from asteroids that collided on the Earth. But how does water form in the asteroids?</p>

CC BY-SA 3.0
2017-03-21T17:24:54.313Z
The sentence "We all know that the water on Earth came from asteroids" seems a bit strong. As far as I know the origin of water on Earth is still being debated:  https://astronomy.stackexchange.com/questions/8206/do-did-the-asteroids-contain-enough-water-to-create-earths-oceans. As can be seen in the answer to https://astronomy.stackexchange.com/questions/10277/how-did-water-get-on-earth there are still differences in the deuterium content between Earth and the asteroids.
arkaia
CC BY-SA 3.0
2017-03-21T17:29:16.540Z
I'm voting to close this question as off-topic because it belongs in astronomy.stackexchange.com
arkaia
CC BY-SA 3.0
2017-03-21T17:42:24.853Z
Please do not multi-post, you [already asked this question](http://astronomy.stackexchange.com/q/20389/1462) on astronomy.
gerrit
CC BY-SA 3.0
2017-03-21T17:47:06.810Z
I'm voting to close this question as off-topic because you already [asked it](http://astronomy.stackexchange.com/questions/20389/how-was-water-formed) on astronomy SE, a community better suited to answer this question because the answer is essentially *from the stars* (although planetary science is on-topic here).
gerrit
CC BY-SA 3.0
2017-03-22T05:34:15.310Z
While already answered, the answer is also basically explained here:   https://en.wikipedia.org/wiki/Frost_line_(astrophysics)
userLTK
CC BY-SA 3.0
2017-03-22T10:38:12.440Z
That question was about how water formed on Earth. Here I am asking as to how water was formed in the asteroids at the first place.
avito009
<water>
From where do asteroids get water from?
avito009
# From where do asteroids get water from?

(Asked by: username_0 on 2017-03-21)

We all know that the water on Earth came from asteroids that collided on the Earth. But how does water form in the asteroids?

**Tags:** water

> **Comments:**
> **username_1**: The sentence "We all know that the water on Earth came from asteroids" seems a bit strong. As far as I know the origin of water on Earth is still being debated:  https://astronomy.stackexchange.com/questions/8206/do-did-the-asteroids-contain-enough-water-to-create-earths-oceans. As can be seen in the answer to https://astronomy.stackexchange.com/questions/10277/how-did-water-get-on-earth there are still differences in the deuterium content between Earth and the asteroids.  
> **username_1**: I'm voting to close this question as off-topic because it belongs in astronomy.stackexchange.com  
> **username_2**: Please do not multi-post, you [already asked this question](http://astronomy.stackexchange.com/q/20389/1462) on astronomy.  
> **username_2**: I'm voting to close this question as off-topic because you already [asked it](http://astronomy.stackexchange.com/questions/20389/how-was-water-formed) on astronomy SE, a community better suited to answer this question because the answer is essentially *from the stars* (although planetary science is on-topic here).  
> **username_3**: While already answered, the answer is also basically explained here:   https://en.wikipedia.org/wiki/Frost_line_(astrophysics)  
> **username_0**: That question was about how water formed on Earth. Here I am asking as to how water was formed in the asteroids at the first place.  

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## 1 answers

### Answer by username_4 on 2017-03-21. Score: 1

hydrogen is the most common element in the universe, Oxygen is the third most common element in the universe, hydrogen + oxygen + heat/energy = water. Water is literally the most common compound in the universe.


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