The problem of nebular theory

[Randolpin]

Nebular theory states that the solar system and other galaxies starts from a gas nebula.We all know that the nebular cloud has a uniform composition.Then how come for example in our solar system, every planet has different composition? Which it should be in the same composition?

 

 

Feedbacks are very much appreciated.Thank you...

[Mordred]

Good question. The secret lies in how the nebula collapses. This is rather complex to explain but essentailly you have the Jean's equation that correlates the rate of infalling matter due to mass etc.

 

This works with the density wave theory as well as the Poynting vectors. Each stage has different but related dynamics that you have to examine each stage separately.

 

For example stage one the collapse itself aided by a cause of collapse. For our solar system. One proposed cause being a supernova nearby.

 

This collapse forms the sun first, however the rotation dynamics induce density waves prior to the Sun going into the fusion stage. A consequence of density waves and rotation is that different mass particles start to distribute differently due to escape velocity orbit relations.

 

Once the Sun enters its fusion stage it causes an outgassing pushing lighter materials away from the sun.

 

The temperature and magnetic field of the sun generates a phenomena due to Poynting vectors in which the different charged particles are driven in different directions. One charge toward the sun, the other away from the Sun. However the Poynting vectors only affect extremely small particles. Smaller than grains of sand. Yet it essentially cleans up the region near the Sun.

 

Through these combinations heavier elements tend to get distributed near the Sun with your lighter elements towards the outer radius.

 

So its not due to one cause but numerous causes.

Edited December 5, 2016 by Mordred