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.
Leaf surface features.
Animals and plants of the intertidal zone adhering to their rocky surface.
Children with autism generally prefer interacting with objects over people.
World Distribution of Temperature
Surface molecules involved in the interaction between an antigen-presenting cell and a CD4+ T cell.
The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum