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What can astronomers use to measure magnetic fields on the Sun?
Q2: If the north celestial pole appears on
Q2: How did Harlow Shapley determine where the
Q4: What observational evidence do we have that
Q7: Why doesn't the Earth experience a solar
Q20: The Earth has a radius of about
Q38: In the Sun,rising currents of hot gas
Q42: If a binary system has a period
Q51: What occurs when some of the material
Q75: Which of the following types of electromagnetic
Q103: Giant and supergiant stars are rare because