How Many Planets Are In The World

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There are eight planets in the solar system:
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

The four inner solar system planets (Mercury, Venus, Earth, and Mars) fall under the category of terrestrial planets; Jupiter and Saturn are gas giants (giant plants composed mostly of hydrogen and helium) while Uranus and Neptune are the ice giants (containing mainly elements heavier than hydrogen and helium).

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