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If I understand the question correctly, you are referring to the layers of a massive star as it nears the end of it's life.
When a massive star nears the end of it's life, it runs out of hydrogen, the outward pressure that has kept it stable for most of it's life, is no longer there, this causes a collapse. This collapse, causes the core to heat up and helium is then fused.
This process repeats several times; each time the core collapses, and the collapse is halted by the ignition of a further process involving more massive nuclei and higher temperatures and pressures.
This creates the onion effect, a distinct layer of different fusing, with the lighter - or easier fused" elements towards the edge.
See related link for a pictorial.
What else can I help you with?
What are the release dates for The Onion News Network - 2007 Bad Boy Fencing Star Implicated in Yet Another Jewel Heist?
The Onion News Network - 2007 Bad Boy Fencing Star Implicated in Yet Another Jewel Heist was released on: USA: 2009
What are the release dates for The Onion News Network - 2007 Restoration of 'Star Spangled Banner' Uncovers Horrifying New Verses?
The Onion News Network - 2007 Restoration of 'Star Spangled Banner' Uncovers Horrifying New Verses was released on: USA: 1 July 2010
What are the release dates for The Onion News Network - 2007 Trekkies Bash New Star Trek Film as 'Fun Watchable'?
The Onion News Network - 2007 Trekkies Bash New Star Trek Film as 'Fun Watchable' was released on: USA: 5 May 2009
What is gran ex onion?
An XL onion, or an onion who decided to not be an onion anymore.
Is an onion a lilly?
No, an onion is not a lily. It is not a flower. An onion is a vegetable.
What part of speech is onion?
Onion is a noun.
How do you spell onion?
onion
What is the difference between onion salt and onion powder?
Onion salt contains salt also whereas onion powder only contains powdered onion.
Why is the post-Main Sequence structure of a high mass star sometimes described by an onion-layer model?
The onion-layer model describes the post-Main Sequence structure of a high mass star because it consists of layers of hydrogen, helium, and heavier elements that have been produced through nuclear fusion reactions. As the star evolves, these layers form concentric shells with different elements at varying depths, much like the layers of an onion. This structure is a result of the star's nuclear burning stages and defines its chemical composition and energy production mechanism.
What is the equivalent measure between granulated onion onion powder and dried minced?
1 Tbls Onion Powder = 1 medium onion, chopped = 4 Tbls fresh chopped onion 1 Tbls Granulated Onion = 1 medium onion, chopped = 4 Tbls fresh chopped onion
How much onion powder equals one large onion?
1/8 teaspoon onion powder equals 1 tablespoon minced onion also read as this: 1/8 teaspoon onion powder equals 1/16 cup of minced onion
What is the correct spelling of onion?
You have spelled onion correctly. It's as stated "Onion."
