Galactic fountains are an important way to explain _____.
a. the distribution of metals in and above the plane of the galactic disk
b. the nature of dark matter
c. the formation of the galactic disk from the first stages of our galaxy
d. the generation and support of spiral density waves
e. why the spiral arms are active sites of star formation
Question 2
The force due to the gravity between two objects depends on the ____,
a. combined mass and velocity of both objects
b. mass of each object and the distance between them
c. distance of each object from Earth and distance between them
d. speed of light and the distance of each object from Earth
e. mass of each object and the speed of light
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