<p>Is an ice planet made only by ice? 
What causes the water to conglomerate and form ice in a planet?</p>

<p>Even if the planet is not made entirely by ice but has an high % of ice (e.g. 50% ice), how can it be explained?</p>

<p>I heard about ice planets with surface temperature way above the melting point.
Can it be explained with surface pressure?
<strong>Edit: This is probably wrong but feel free to point it out in a full answer</strong></p>

<p>Thanks.</p>

CC BY-SA 3.0
2016-11-29T12:27:04.583Z
Can you provide a link to the 3rd one.  Ice planets with higher than melting point surface temperature?
userLTK
CC BY-SA 3.0
2016-11-29T14:45:35.210Z
No link sorry, it was told to me. It could be totally wrong.
A.Danzi
CC BY-SA 3.0
2016-11-29T15:02:41.170Z
Phase diagram for water: http://www1.lsbu.ac.uk/water/water_phase_diagram.html Liquid There are solid phases up to 1000°K, but that's under multi giga Pascal pressure. Sea level norm pressure on earth is a mere 101325 Pascals.
Wayfaring Stranger
CC BY-SA 3.0
2016-11-29T15:07:52.097Z
Probably wrong then.. will update the OP
A.Danzi
CC BY-SA 3.0
2016-11-29T15:27:18.790Z
Maybe I'll turn this into an answer later, but generally ice planets or ice moons form outside the frost line.   https://en.wikipedia.org/wiki/Frost_line_(astrophysics) where ice behaves like rock, it's frozen.   Ice planets aren't 100% ice, on average, maybe about half ice by mass, half other stuff, but that ratio likely varies quite a bit.   There's no liquid water in space, just frozen and gaseous water vapor atoms.   Vapor and icy debris can coalesce into an ice planet similar to how a rocky planet forms.
userLTK
CC BY-SA 3.0
2016-11-29T15:57:24.280Z
Recommend closing as not clear.
Carl Witthoft
<planet><temperature>
Is an ice planet made only by Ice?
A.Danzi
# Is an ice planet made only by Ice?

(Asked by: username_0 on 2016-11-29)

Is an ice planet made only by ice?
What causes the water to conglomerate and form ice in a planet?

Even if the planet is not made entirely by ice but has an high % of ice (e.g. 50% ice), how can it be explained?

I heard about ice planets with surface temperature way above the melting point.
Can it be explained with surface pressure?
**Edit: This is probably wrong but feel free to point it out in a full answer**

Thanks.

**Tags:** planet, temperature

> **Comments:**
> **username_1**: Can you provide a link to the 3rd one.  Ice planets with higher than melting point surface temperature?  
> **username_0**: No link sorry, it was told to me. It could be totally wrong.  
> **username_2**: Phase diagram for water: http://www1.lsbu.ac.uk/water/water_phase_diagram.html Liquid There are solid phases up to 1000°K, but that's under multi giga Pascal pressure. Sea level norm pressure on earth is a mere 101325 Pascals.  
> **username_0**: Probably wrong then.. will update the OP  
> **username_1**: Maybe I'll turn this into an answer later, but generally ice planets or ice moons form outside the frost line.   https://en.wikipedia.org/wiki/Frost_line_(astrophysics) where ice behaves like rock, it's frozen.   Ice planets aren't 100% ice, on average, maybe about half ice by mass, half other stuff, but that ratio likely varies quite a bit.   There's no liquid water in space, just frozen and gaseous water vapor atoms.   Vapor and icy debris can coalesce into an ice planet similar to how a rocky planet forms.  
> **username_3**: Recommend closing as not clear.  

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