Most of the mass of the Milky Way seems to exist in the form of:
A) Population I stars in the disk.
B) Population II stars in the Halo.
C) hydrogen gas in the disk and spiral arms.
D) dark matter out in the Halo.
E) the black hole in the Galactic Center.
D
You might also like to view...
Applications to Astronomy: Four different main-sequence stars are colored blue, orange, red, and yellow. What is their rank from coolest to hottest?
A. blue, yellow, orange, red B. orange, blue, yellow, red C. red, orange, yellow, blue D. red, yellow, orange, blue
A box weighing 550N slides at constant speed across a flat parking lot, under the influence of a stiff wind. The wind applies a force of 155N parallel to the surface of the parking lot. What is the angle relative to the vertical of the contact force applied by the ground.
a. 
b. 
c. 
d. 
e. 
Impulse: A 0.140-kg baseball is thrown with a velocity of 27.1 m/s. It is struck by the bat with an average force of 5000 N, which results in a velocity of 37.0 m/s in the opposite direction from the original velocity. How long were the bat and ball in contact?
A. 1.79 × 10-3 s B. 1.28 × 10-2 s C. 3.07 × 10-2 s D. 4.30 × 10-3 s
Relate silica content to crystallization from a magma
What will be an ideal response?