The number of sunspots
A) remains approximately constant.
B) increases and decreases at random intervals.
C) increases and decreases in a yearly cycle.
D) increases and decreases in an 11-year cycle.
Correct Answer:
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Q1: Nuclear reactions in the sun's interior convert
A)
Q6: The spectrum of a star can provide
Q17: Solar storms may affect
A)the earth's magnetic field.
B)electric
Q19: As compared with a large telescope mirror,
Q23: The color of a relatively hot star
Q24: Stars whose intrinsic brightness and period of
Q32: The earth's magnetic field influences
A) comets.
B) meteoroids.
C)
Q38: Auroras consist of
A) colored clouds.
B) comet tails.
C)
Q39: There is a surprisingly small variation among
Q44: The smallest of the following celestial objects
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