The percentage (by mass) of the Sun that is helium is about: ...

[michelleunicorn]

The percentage (by mass) of the Sun that is helium is about:
 
  A) 91.
  B) 71.
  C) 27.
  D) 9.
  E) less than 1.

Question 2

Sometime within the next million years or so, their planet is likely to be doomed because
 
  A) jets of material shot out of the accretion disk will shoot down their planet.
  B) their planet receives most of its energy from the red giant. However, this star will soon be completely devoured in the accretion disk and thus will no longer exist.
  C) the red giant will probably undergo a supernova explosion within the next million years.
  D) tidal forces from the black hole will rip the planet apart.
  E) the planet's orbit gradually will decay as it is sucked in by the black hole.

[reversalruiz]

Answer to Question 1

C

Answer to Question 2

C