What must be true in order for astronomers to be able to use the Doppler technique to determine a planet's mass?
A) The planet's orbit must be viewed nearly edge on.
B) The planet must have a very low mass.
C) The planet must have a very eccentric orbit.
D) The planet's orbit must be seen nearly face on.
A
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The disk of the Milky Way is approximately 20,000 ly in diameter
Indicate whether the statement is true or false
Elliptical galaxies contain a mix of old and young stars
a. True b. False Indicate whether the statement is true or false
Mercury is still geologically active today
a. True b. False Indicate whether the statement is true or false
A large water storage container is filled to a depth of 3.0 m. The volume above the water is filled with air. In order to pump the water from the container, the air pressure in the container is increased by 3.0 
105 N/m2. What happens to the pressure in the water at a depth of 1.0 m when the air pressure is increased?
A.
B.
105 N/m2, since it is at 1/3 the depth of the water.C.
105 N/m2, since it is at 2/3 the depth from the bottom of the container.D.
105 N/m2.E.
105 N/m2 + 9.8 
103 N/m2 since it is 1.0 m deep in the water.