When looking for the Doppler Wobble (radial velocity changes ...

[ss2343]

When looking for the Doppler Wobble (radial velocity changes detected due to Doppler shifts), which mass combination is most likely to be detected?
 
  A) High mass star, high mass planet
  B) High mass star, low mass planet
  C) Low mass star, high mass planet
  D) Low mass star, low mass planet
  E) A high mass planet; the mass of the star is irrelevant.

Question 2

If dark nebulae are really dark, how do we know they are there?
 
  What will be an ideal response?

[jointhecircus]

Answer to Question 1

C

Answer to Question 2

In some cases, they are not thick enough to block all light, so allow some red light through. Even if dense enough, they can still be seen in profile against rich star fields that lie behind them in the plane of the Milky Way.

[ss2343]

Great answer, keep it coming

[xiaomengxian]

Thanks for the timely response, appreciate it