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What can astronomers use to measure magnetic fields on the Sun?
Q3: Which of the following is a set
Q20: In an H-R diagram,where are the stars
Q42: What is the temperature of an object
Q46: Which of the following is believed to
Q64: Why is there a main sequence mass-luminosity
Q73: What was a common feature of astronomy
Q80: Most of the visible light from the
Q84: The Sun appears to rotate only because
Q90: Look carefully at this diagram of a
Q152: Do the constellations visible in the sky