The two chief elements in the sun are
A) hydrogen and helium.
B) hydrogen and oxygen.
C) oxygen and nitrogen.
D) carbon and iron.
Correct Answer:
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Q9: Sunspot activity does not affect
A) auroras.
B) the
Q10: A large modern astronomical telescope
A) is designed
Q11: A star whose spectral lines are shifted
Q12: The source of the sun's energy is
A)
Q13: Streams of protons and electrons from the
Q15: The sun has
A) no atmosphere.
B) an atmosphere
Q16: The sun is an)
A) unusually small star.
B)
Q17: The duration of the sunspot cycle is
Q18: The temperature of the sun's photosphere is
Q19: Which of the following can appear as
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