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We know Mercury must have a large metal core because it has a high density.
Q5: Of the following breath descriptions,which one is
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Q13: The condition that is associated with an
Q21: Mars has sufficient mass and a low
Q28: What is the current best determination of
Q40: How might we tell whether the universe
Q44: Once a star ejects a planetary nebula,it
Q56: What is the difference between homogeneity and
Q102: How do astronomers know that there is