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Q1: Which of the following properties of an
Q4: The figure below shows how the space
Q5: How did astronomers rule out the MACHO
Q17: An astronomer discovers a region on the
Q30: Why are most galaxies inside clusters ellipticals
Q40: What two reasons are most important in
Q40: The figure below shows the orbits of
Q60: What does it mean for a giant
Q69: A planet follows the orbit around the
Q69: The oxygen in Earth's atmosphere was first