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The faster-moving star in a binary is the
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Q11: You observe three different star clusters and
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Q20: How does convection in the core of
Q21: The lowest-density gas in the interstellar medium
Q25: When radiation from an object passes through
Q36: Do we expect a planet's rings to
Q40: Sunspots appear dark because they have _
Q64: Each helium atom created through the proton-proton
Q65: Along which type of plate boundary are