Could the Milky Way's Dense Oort Cloud Mean a Richer Galactic Landscape?

  • Level: Undergrad 
  • Thread starter Thread starter Dark Universe
  • Start date Start date
  • Tags Tags
    Milky way Structure
Join the discussion
Registration is free. Start your own thread to ask a follow-up.
Sign up Log in
40 replies · 11K views
But, a huge gas giant could be perturbed into a tighter orbit after it had already formed. Its massive gravity would slow loss of its atmosphere for a long time.
 
Astronomy news on Phys.org
Chronos said:
But, a huge gas giant could be perturbed into a tighter orbit after it had already formed. Its massive gravity would slow loss of its atmosphere for a long time.

How long will keep it's atmosphere?
Tousands, M\Hundreds of tousands, Millions, Tens of millions of years... BILLIONS?:confused:
 
Chalnoth said:
Otherwise you'll just get a gas giant with a rocky core.

but Would't the rocky core get crushed under the mass of the atmosphere and become a liquid... Or diamonds if it has a significant amount of carbon?
 
Constantin said:
"
"-And another question: If a nebula has about 100 or more light years in diameter and if it is very thick and mostly composed out of H2 what type of stars tend to take birth in there?
And can they have solid planets rather than gas giants?"
I don't know what kind of stars would take birth in that nebula.

If the nebulla is so thick and mostly composed out of H2 wouldn't there be a significant amount of Blue giands or super giants of stars as there is plenty of material to form out of?
 
"How long will keep it's atmosphere?
Tousands, M\Hundreds of tousands, Millions, Tens of millions of years... BILLIONS?"
Billions of years, at least. There are plenty of examples of gas giants that orbit their stars very closely. It is assumed they formed further away and they later migrated closer to the star.

"but Would't the rocky core get crushed under the mass of the atmosphere and become a liquid... Or diamonds if it has a significant amount of carbon?"
Yes, because of the very high amounts of pressure, it will change its state. I don't know if it will be molten or not.
But that happens in the core of our planet as well. The very core of our planet is solid, surrounded by a larger, molten region. So at extreme pressures you can get a solid core even with very high temperatures.
 
Constantin said:
The very core of our planet is solid, surrounded by a larger, molten region. So at extreme pressures you can get a solid core even with very high temperatures.

With that i agree with you...
-But this kind of event can hapopen to any kind of material even water...
Recent discoveries of theoretical ocean worlds or super Earth's that are almost 100% water, if they are big enaugh their core can get solid; ice7, right?
And what about the recently discovered Kepler-22b?
Studies show that it could be another ocean world...
I don't quite remember its theoretical size but could it have a rocky underwater surface or its all the way down to another ice7 core?
-And could it have small rocky islands?
-Could it be colonized?
 
Last edited:
Dark Universe said:
With that i agree with you...
-But this kind of event can hapopen to any kind of material even water...
Recent discoveries of theoretical ocean worlds or super Earth's that are almost 100% water, if they are big enaugh their core can get solid; ice7, right?
And what about the recently discovered Kepler-22b?
Studies show that it could be another ocean world...
I don't quite remember its theoretical size but could it have a rocky underwater surface or its all the way down to another ice7 core?
-And could it have small rocky islands?
-Could it be colonized?

Heeey... no answer to this?
 
Dark Universe said:
but Would't the rocky core get crushed under the mass of the atmosphere and become a liquid... Or diamonds if it has a significant amount of carbon?

No, puting a liquid under ridiculous amounts of pressure (with a few exceptions such as water and gallium) results in a solid, not the other way around.
 
Whovian said:
No, puting a liquid under ridiculous amounts of pressure (with a few exceptions such as water and gallium) results in a solid, not the other way around.

as far as I know, with water it's even believed that under sufficiently extreme pressures an exotic or exotic forms of ice can be formed.
 
Whovian said:
No, puting a liquid under ridiculous amounts of pressure (with a few exceptions such as water and gallium) results in a solid, not the other way around.

True. The molten core is a result of temperature, not pressure.
However, what you're saying about water or gallium is false. They will turn to solid just fine.

In regards to water turning to ice at high pressure, I've seen experiments with diamond anvil doing just that.