Generally speaking, how does the surface temperature and luminosity of a protostar compare to the surface temperature and luminosity of the main-sequence star it becomes?
A) A main-sequence star is cooler and dimmer than it was as a protostar.
B) A main-sequence star is cooler and brighter than it was as a protostar.
C) A main-sequence star is hotter and brighter than it was as a protostar.
D) A main-sequence star is hotter and dimmer than it was as a protostar.
Question 2
The gravitational lens effect has been verified by
A) observations of multiple images of the same background galaxy seen towards a massive galaxy cluster.
B) single images of highly distorted, high-redshift galaxies seen towards massive galaxy clusters.
C) observations of the bending of starlight by the Sun during a 1919 eclipse.
D) all of the above
E) None of the above; this effect is purely hypothetical.
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