Which type of feature is the best evidence of lunar volcanism? ...

[james0929]

Which type of feature is the best evidence of lunar volcanism?
 
  A) Rays around the latest eruptions
  B) Craters all over the Moon
  C) Vents seen erupting in the mountainous highlands
  D) Rilles associated with lava flows accompanying the mare formation
  E) The Orientale Basin

Question 2

Algol consist of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. Why does this seem surprising, at least at first?
 
  A) The two stars in a binary system should both be at the same stage of life; that is, they should either both be main-sequence stars or both be subgiants.
  B) It doesn't make sense to find a subgiant in a binary star system.
  C) The two stars should be the same age, so we'd expect the subgiant to be more massive than the main-sequence star.
  D) A star with a mass of 3.7 MSun is too big to be a main-sequence star.

[yotaSR5]

Answer to Question 1

D

Answer to Question 2

C

[james0929]

Thanks for the timely response, appreciate it

[jackie]

Great answer, keep it coming