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Giant planet
A
giant planet
is any massive
planet
. They are usually primarily composed of low-boiling-point materials (
gases
or ices), rather than
rock
or other
solid
matter, but
massive solid planets
can also exist. There are four giant planets in the
Solar System
:
Jupiter
,
Saturn
,
Uranus
and
Neptune
. Many
extrasolar
giant planets have been identified orbiting other
stars
.
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