If a main sequence, giant, and a supergiant all have the same spectral class, what characteristic is known to make these stars different?
A. surface temperature
B. color
C. luminosity
D. distance
E. It shows that the more massive stars are cooler.
Answer: C
You might also like to view...
How was the rotation rate of Jupiter's core determined?
A) by observing the Great Red Spot B) by watching Io move across the disk of Jupiter C) by radio observations of Jupiter's rapidly spinning magnetosphere D) by observing the fastest moving regions of Jupiter's equator E) by measuring the oblateness of Jupiter's disk
Plate tectonics differs from continental drift because it
A) provides a credible driving force. B) did not explain the fit between South America and Africa. C) showed that ancient ice sheets did not exist. D) showed that Pangaea broke up much later than predicted.
Refer to the sketch above of an H-R diagram for a star cluster. Consider the star to which the arrow points. How is it currently generating energy?
A) by gravitational contraction B) by hydrogen shell burning around an inert helium core C) by core hydrogen fusion D) by core helium fusion combined with hydrogen shell burning E) by both hydrogen and helium shell burning around an inert carbon core
A key difference between the tragedy of the commons and TANSTAAFL is that
a. TANSTAAFL applies to chemistry, the tragedy of the commons to physics. b. both apply to all situations; so there is no difference. c. TANSTAAFL applies to sociology, the tragedy of the commons to economics. d. TANSTAAFL applies to economics, the tragedy of the commons to physical systems. e. TANSTAAFL applies to physical systems, the tragedy of the commons to socialsystems.