___________ of the Milky Way contains mostly old (population II) ...

[tiara099]

___________ of the Milky Way contains mostly old (population II) stars and globular clusters.
 
  a. The disk component
  b. The spherical halo component
  c. The hydrogen gas in the disk
  d. The spiral arms
  e. Sgr A

Question 2

What information about orbital inclination can we get from visual binaries, spectroscopic binaries, and eclipsing binaries?
 
  What will be an ideal response?

[hugthug12]

Answer to Question 1

.E

Answer to Question 2

Astronomers can find the inclination of a visual binary system because they can see the shape of the orbits. In a spectroscopic binary system, however, the individual stars are not visible, so the orbits can't be mapped and the inclination can't be found. In eclipsing binary systems the inclination is edge-on.

[tiara099]

TYSM

[ryansturges]

Great answer, keep it coming