Gravitational lensing
a. occurs when light passes near a massive object and is deflected by the object's gravitational field.
b. can be used to determine the luminosity of a galaxy.
c. occurs when the mass of a galaxy is greater than expected from the luminosity of the galaxy.
d. occurs when the mass of a galaxy is less than expected from the luminosity of the galaxy.
e. can be used to determine the recessional velocity of a galaxy.
Question 2
Hydrostatic equilibrium refers to the balance between weight and pressure.
a. True
b. False
Indicate whether the statement is true or false
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