Auroras consist of
A) colored clouds.
B) comet tails.
C) excited gases in the lower atmosphere.
D) excited gases in the upper atmosphere.
Correct Answer:
Verified
Q33: Red giant stars
A) are not very bright.
B)
Q34: The main sequence on the HR diagram
Q35: The distance of a star from the
Q36: White dwarf stars are not
A) comparable in
Q37: In order to determine the mass of
Q39: There is a surprisingly small variation among
Q40: The less the mass of a main-sequence
Q41: At the end of its period in
Q42: A gamma-ray burst is a short, intense
Q43: Brown dwarfs are
A) visible to the naked
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