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Q16: If a star is found with five
Q18: The density of Comet Halley was found
Q24: When a star of mass comparable to
Q29: Which planetary fact(s) is(are) explained by the
Q39: No known white dwarf has a mass
Q57: Spiral tracers tend to be old, luminous
Q60: How are neutron stars and white dwarfs
Q61: The diagram below shows the relative size
Q66: Most of the mass of a galaxy
Q79: The absence of folded mountain ranges on