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Q3: In the late 18th century, two astronomers,
Q3: What part of the Apollo spacecraft actually
Q5: Long-period comets originate in the _.
Q17: The composition of Jupiter is much like
Q22: Phobos is so close to Mars that
Q23: Which of the Galilean moons is essentially
Q40: Where are volcanoes most common?<br>A) subduction zones<br>B)
Q49: Which spacecraft was the first to photograph
Q50: Venus's tectonic processes seem to be vertical
Q54: The mass of a galaxy's central black