Compared to stars within the disk, halo stars

Compared to stars within the disk, halo stars
 
  a. orbit at random inclinations to the galactic plane b. orbit at different speeds
  c. orbit with paths crossing d. All of the other choices are correct.

Question 2

Absorption lines due to interstellar gas
 
  a. are wider than the lines from stars because the gas is hotter than most stars.
  b. are narrower than the lines from stars because the gas has a lower pressure than stars.
  c. indicate that the interstellar medium contains dust.
  d. indicate that the interstellar medium is expanding away from the Sun.
  e. None of the other choices are correct.

Question 3

Where are the Large Magellanic Cloud and Small Magellanic Cloud located?
 
  a. in the spiral arms b. in the disk
  c. in the bulge d. None of the other choices are correct.

Question 4

Stars are born in
 
  a. reflection nebulae.
  b. dense molecular clouds.
  c. HII regions.
  d. the intercloud medium.
  e. the local bubble.