For measuring the distances to galaxies within 17 Mpc, we rely ...

[lidoalex]

For measuring the distances to galaxies within 17 Mpc, we rely primarily on ________ variable stars.
 
  Fill in the blank(s) with correct word

Question 2

Which of the following are signposts of the presence of high mass stars, and thus recent star formation?
 
  A) closely spaced low mass stars
  B) predominantly blue reflection nebulae
  C) predominantly red ionization nebulae
  D) A and C
  E) B and C

[trampas]

Answer to Question 1

Cepheid

Answer to Question 2

E

[lidoalex]

Thanks for the timely response, appreciate it

[bassamabas]

Great answer, keep it coming