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Q9: You observed three different star clusters and
Q12: The Type II supernova that created the
Q18: If the carbon dioxide in Earth rocks
Q29: We can identify only a small fraction
Q32: What types of chemical elements can low-mass
Q41: The fraction of mass in the Sun
Q45: Winds are generated on Earth because the
Q56: Which sequence correctly lists the spectral classes
Q65: Primary waves are seismic longitudinal waves whose
Q68: How does the tidal stress on the