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Basis
for comparisons is Earth
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Properties
of Earth
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Similarities
and differences with Mars and
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Venus
help us understand Earth better (e.g.,
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life,
greenhouse effect, etc.)
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Won�t spend class time on basic properties
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(size, gravity, orbital period, length of day,
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number of moons, etc.) but you should have
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some relative ideas about these (see �Data
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Files� in text).
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