What is the significance of 8 solar masses in stellar evolution? ...

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What is the significance of 8 solar masses in stellar evolution?
 
  What will be an ideal response?

Question 2

Dust is an important part of the nebular theory of solar system formation because dust is needed to explain:
 
  A) how the inner planets came to be rocky bodies.
  B) how the outer planets came to be gaseous bodies.
  C) how the initial cloud cooled enough to collapse.
  D) how the initial cloud heated as it contracted.
  E) why the icy bodies are located so far from the Sun.

[frre432]

Answer to Question 1

Above 8 solar masses, a high mass star must go through a violent type II supernova core collapse, producing a neutron star or even a black hole for the most massive stars. Below that limit, a low mass star will shed enough mass in its giant and planetary nebula stages to avoid the core collapse, and eventually settle down into a white dwarf.

Answer to Question 2

A