When Mars is located directly behind the Earth with respect to ...

[bucstennis@aim.com]

When Mars is located directly behind the Earth with respect to the Sun in its orbit, it is
 
  a. at the midpoint in the sky between east and west at sunset.
  b. at the midpoint in the sky between east and west at midnight.
  c. at the midpoint in the sky between east and west at sunrise.
  d. at the midpoint in the sky between east and west at noon.
  e. not visible in the night sky.

Question 2

What characteristic of a star primarily determines its location on the main sequence?
 
  a. age
  b. distance from the galactic center
  c. mass
  d. space motion
  e. radius

[macybarnes]

Answer to Question 1

B

Answer to Question 2

C

[bucstennis@aim.com]

Gracias!

[bassamabas]

Thanks for the timely response, appreciate it