Why does stellar main-sequence lifetime decrease with increasing ...

[clippers!]

Why does stellar main-sequence lifetime decrease with increasing stellar mass?
 
  A) It doesn't; higher mass stars have more hydrogen available for fusion, and thus have longer lifetimes.
  B) Strong stellar winds cause higher mass stars to lose mass quickly.
  C) Higher outward pressure prevents the core hydrogen from being replenished by the star's outer layers.
  D) Higher core temperatures cause fusion to proceed much more rapidly.

Question 2

Extrasolar planets have been discovered with average densities similar to
 
  A) styrofoam.
  B) iron.
  C) water.
  D) all of the above
  E) none of the above

[emsimon14]

Answer to Question 1

D

Answer to Question 2

D

[clippers!]

Excellent

[sarah_brady415]

TYSM