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Q1: The Kirkwood gaps are regularly spaced gaps
Q5: In an accelerator, a massive particle may
Q20: When helium fusion begins in the core
Q21: The lowest-density gas in the interstellar medium
Q45: When a star burns hydrogen in a
Q58: If neutrinos oscillated between five different types
Q74: When winds blow the gas away from
Q76: Describe two challenges faced by astronomers in
Q81: Iron meteorites are fragments of which type
Q98: Through hydrogen fusion, the Sun loses approximately