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What are the small bits of rock and metal that collide with Earth's atmosphere?
Q9: What direct evidence is there for galactic
Q9: Explain why it is a common misconception
Q10: The Apollo spacecraft had a(n) _ tacked
Q17: High-mass stars evolve differently than medium-mass stars
Q20: Which theory best describes today's current thinking
Q22: Venus has no _ to absorb the
Q25: Ordinary matter makes up approximately _percent of
Q33: Galactic fountains are an important way to
Q37: The _ on Uranus passes very near
Q63: The winds of Neptune have a tendency