What role do molecules play in spectral classification? What ...

[maegan_martin]

What role do molecules play in spectral classification?
 
  What will be an ideal response?

Question 2

What use are 21-cm radio waves to galactic astronomers?
 
  A) They bounce off stars like our Sun to let us precisely measure their distances.
  B) We can reflect them off the core of the Galaxy.
  C) They pick up the cool, dark matter much better than can optical telescopes.
  D) They cut through the dusty cocoons to let us watch star birth.
  E) Their Doppler shifts let us map the motions and locations of gas in the spiral arms.

[Zack0mack0101@yahoo.com]

Answer to Question 1

Molecules can only form at temperatures of type M stars, not in hotter ones.

Answer to Question 2

E

[maegan_martin]

Thanks for the timely response, appreciate it

[kjohnson]

Wow, this really help