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What is Pi?

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101 Pi Facts

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Puppis Constellation

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Asellus Primus (θ Boötis)

Alphard (α Hydrae) Star

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The Eight Planets

Mercury
Venus
Earth
Mars
Jupiter
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Uranus
Neptune

Eight Planets for Kids

Mercury
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Mars
Jupiter
Saturn
Uranus
Neptune

Five Dwarf Planets

Ceres
Pluto
Haumea
Makemake
Eris

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The Solar System for Kids

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About Nine Planets

The Nine Planets has been online since 1994 and was one of the first multimedia websites that appeared on the World Wide Web.

Take an interactive tour of the solar system, or browse the site to find fascinating information, facts, and data about our planets, the solar system, and beyond.

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