In order to predict whether a star will eventually fuse oxygen ...

[Redwolflake15]

In order to predict whether a star will eventually fuse oxygen into a heavier element, you mainly want to know what fact about the star?
 
  A) how much oxygen it now has in its core
  B) its mass
  C) its luminosity
  D) its overall abundance of elements heavier than helium

Question 2

What is the best alternative explanation for the dark matter in the Milky Way based on the observed orbital motions of stars and gas?
 
  A) We are not measuring the orbital velocities of gas clouds and stars properly.
  B) We are not measuring the distances to gas clouds and stars properly.
  C) There is something wrong with our understanding of how gravity works.
  D) We are not attributing enough mass to the visible matter in the Milky Way.
  E) We are not observing all the visible matter in the Milky Way.

[SVictor]

Answer to Question 1

B

Answer to Question 2

C

[Redwolflake15]

Thanks for the timely response, appreciate it

[deja]

Great answer, keep it coming