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.
Mutualisms, such as those that occur among plants and pollinators, generally involve large numbers o
The Spectra of Stars with Different Surface Temperatures.
Average Global Temperature during the Phanerozoic
Clear the tarsals, metatarsals, and toes. Stand at the end of the table, support the plantar surface ...
Correlates well with global temperature prior to the impact of GHG emissions
Calculate KP for the following reactions at the indicated temperature.