Physicists and astronomers usually refer to the permitted orbits of an atom as the atom's _______________ levels.
Fill in the blank(s) with correct word
Question 2Quasars ____.
a. are common at all ages of the Universe
b. are the early stages of what become Seyfert galaxies
c. disrupt galactic formation and become isolated black holes
d. are an early stage of the formation of common galaxies
e. are formed from double-lobed radio galaxies
Question 3An atom can only have orbits of certain sizes, called _______________ orbits.
Fill in the blank(s) with correct word
Question 4Quasars are common in the early Universe because ____ at that time.
a. galactic collisions were more frequent
b. black hole collisions were more frequent
c. gas and dust clouds were denser
d. galaxies were more isolated
e. central bulges were larger
Question 5A(n) _______________ is an atom that has gained or lost one or more electrons.
Fill in the blank(s) with correct word
Question 6The formation of a galactic central bulge is believed to ____.
a. be a slow steady process lasting billions of years
b. start after the formation of spiral arms
c. be a violent process which adds mass to the central black hole
d. begin when the central black hole has reached mature size
e. continue throughout the galaxy's life body
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