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Q7: Compared to young stars, very old stars
Q10: Around 4 billion years ago Venus could
Q23: Which of the following is not a
Q49: Which of the following is not a
Q52: How did the Ptolemaic model explain the
Q60: A net force acting on an object
Q66: A million years from now, Alpha Centauri
Q78: Which of the following is a consequence
Q88: The Milky Way is moving further away
Q100: Which planet (besides Earth) has been visited