Stars whose intrinsic brightness and period of variation are related are called
A) pulsars.
B) Cepheid variables.
C) main-sequence stars.
D) red giants.
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Q19: As compared with a large telescope mirror,
Q20: The number of sunspots
A)remains approximately constant.
B)increases and
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A) comets.
B) meteoroids.
C)
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A) are not very bright.
B)
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