Which kind of active galaxies has been observed at the greatest distances from us?
a. Seyfert galaxies
b. radio galaxies
c. quasars
Question 2
A white dwarf is composed of
a. hydrogen nuclei and degenerate electrons.
b. helium nuclei and normal electrons.
c. carbon and oxygen nuclei and degenerate electrons.
d. degenerate iron nuclei.
e. a helium burning core and a hydrogen burning shell.