What would be most likely to disrupt the normal evolution of a ...

[OSWALD]

What would be most likely to disrupt the normal evolution of a star? Give examples of this.
 
  What will be an ideal response?

Question 2

A circular orbit would have an eccentricity of:
 
  A) 0.
  B) between 0 and 0.5.
  C) between 0.5 and 1.
  D) exactly 1.0.
  E) infinity.

[Brummell1998]

Answer to Question 1

If it has a close companion, mass transfer may change the masses of both stars and greatly change the evolutionary tracks of both stars. Nova and type I supernovae are both created by mass transfer changes.

Answer to Question 2

A

[OSWALD]

TYSM

[irishcancer18]

Thanks for the timely response, appreciate it