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1.1 a
1.1 b
1.1 c
1.1 d
1.1 e
1.1 f
1.2 a
1.2 b
1.2 c
1.2 d
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1.1b
Nine
planets
move around the
Sun
in nearly circular
orbits
.
The orbit of each planet is an
ellipse
with the Sun located at one of the
foci
.
Earth is orbited by one
moon
and many artificial
satellites
.
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