In order to turn a star's proper motion into its space velocity, ...

[strangeaffliction]

In order to turn a star's proper motion into its space velocity, we must also know
 
  A) its mass and spectral type.
  B) its temperature and age.
  C) its distance and radial velocity.
  D) its distance and mass.
  E) its spectral type and period of rotation.

Question 2

What information do we know about the known exoplanets?
 
  A) estimates of orbits and masses
  B) complete composition
  C) precise masses
  D) All of the above
  E) None of the above

[Laurenleakan]

Answer to Question 1

C

Answer to Question 2

A

[strangeaffliction]

Thanks for the timely response, appreciate it

[jackie]

Excellent