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Ice giant
An
ice giant
is a
giant planet
composed mainly of elements heavier than
hydrogen
and
helium
, such as
oxygen
,
carbon
,
nitrogen
, and
sulfur
. There are two known ice giants in the
Solar System
,
Uranus
and
Neptune
. Since 2014, there has been evidence of the existence of a third ice giant, which, if found, would be the solar system's
ninth planet
.
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