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Why are there no smaller craters on the surface of Venus, only bigger ones?
Q5: The most important function of an astronomical
Q10: How far away would a star with
Q19: One way in which the ozone layer
Q20: Astronomers estimate that the runoff channels seen
Q24: The largest and most massive of Saturn's
Q26: How were the rings of Uranus discovered?<br>A)
Q28: Saturn's ring particles are composed mainly of:<br>A)
Q32: Some of the energy produced in the
Q37: To obtain the wonderful images of the
Q40: Which of the following is NOT a