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Q6: Why is it surprising that spiral arms
Q7: Remember Kepler's third law, which relates the
Q16: Asteroids are the last of the icy
Q24: Earth's core is hot, dense, and mostly
Q44: Black hole jets are believed to be
Q48: Supernovae are triggered because iron releases the
Q52: The black hole at the center of
Q57: One way to measure and compare the
Q63: Binary systems with pairs of stars orbiting
Q72: Consider the complete magnetic cycle of sunspot