Of what is the galactic halo presumed to be composed? What ...

[captainjonesify]

Of what is the galactic halo presumed to be composed? What evidence supports this conclusion?
 
  What will be an ideal response?

Question 2

The NASA lander which deployed the first rover, Sojourner, in 1997 was:
 
  A) Mars Rover.
  B) Global Surveyor.
  C) Viking 2.
  D) South Polar Lander.
  E) Pathfinder.

[lgoldst9]

Answer to Question 1

The globular clusters are most obvious, but it also has many loose stars of Population II, escaped from their clusters, and a great deal of dark matter, whose true nature is still uncertain; brown dwarfs, black holes, and white dwarfs are all possible candidates.

Answer to Question 2

E

[captainjonesify]

Thank you!

[lgoldst9]

Always glad to help...