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Q3: Which star appears brightest in the sky?
Q49: The first planets around other Sun-like stars
Q63: Astronomers have discovered more planets around other
Q88: According to our modern understanding,what is a
Q92: Compared to the star it evolved from,a
Q99: Processed meteorites with low metal content probably
Q109: The number of comets in the Oort
Q110: Which of the following observations would not
Q112: What do asteroids and comets have in
Q126: Why did Earth retain most of its