The remaining core of a planetary nebula is called a(n) ______________.
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Q155: The angular measure in degrees north or
Q156: Gas and dust distributed among the stars
Q157: Eighty-eight prominent groups of stars in the
Q158: When the absolute magnitudes, or brightnesses, of
Q159: The Greek astronomer who assigned the stars
Q161: The cataclysmic explosion of a star that
Q162: Clusters containing clusters of galaxies are called
Q163: The lifetime of a star is determined
Q164: The letters LMC refer to the galaxy
Q165: An extremely large collection of stars bound
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