A star like the sun has a luminosity of 
How much mass must be turned into energy each second to produce this power?
A. 
B. 
C. 
D. 
E. 
B.
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Why are Cepheid variables so important for measuring distances in astronomy?
A) They all have the same luminosity. B) They all have the same period. C) Their luminosity can be inferred from their period. D) They are close enough to have a detectable parallax. E) They are circumpolar like Polaris, the North Star.
The tidal stresses that create Io's volcanism come from Jupiter and
A) Titan. B) the Sun. C) Callisto. D) Europa. E) Ganymede.
How can Wein's law be used to determine the temperature of a star?
What will be an ideal response?
The equivalence principle can be best illustrated by ____
a. a person riding in an elevator b. a rocket coasting through space at a constant velocity c. the change in mass of a moving body d. the formation of energy by nuclear fusion e. a car ride on a highway with the windows open