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Astronomers call the motion of a star across the sky (perpendicular to our line of sight) its
Q2: Among solid worlds, which type of world
Q3: Astronomers have established that quasars and active
Q4: As astronomers use the term, the parallax
Q10: When astronomers have examined rich clusters of
Q15: The largest satellite (moon) in the solar
Q18: Given the presence of dust throughout the
Q19: Which of the following statements about dark
Q22: What observations about disks of dusty material
Q24: How do astronomers know that pulsating variable
Q27: Which is one reason that the typical