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Q10: Sometimes elements of several different events are
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Q47: The tendency to see a shoe as
Q48: What causes the precession of the Earth's
Q48: What does a typical galaxy like our
Q53: What is opacity?<br>A)the balance between the pressure
Q72: The most common kinds of stars are
Q90: Look carefully at this diagram of a
Q96: Why might astronomers some day establish an
Q102: Luminosity class IV objects are known as