The star at the center

Sun

The star at the center of our solar system.

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The swift planet

Mercury

A cratered world of extreme temperatures.

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The veiled planet

Venus

A cloud-covered world with a runaway atmosphere.

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The blue planet

Earth

The only world known to harbor life.

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The red planet

Mars

A cold desert world written in rust-red dust.

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The giant planet

Jupiter

A stormy gas giant wrapped in bands of cloud.

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The ringed planet

Saturn

A gas giant encircled by bright icy rings.

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The tilted planet

Uranus

An ice giant rolling around the Sun on its side.

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The blue world

Neptune

A distant world of supersonic winds.

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Topics

Dive deeper into the worlds of our solar system with our comprehensive educational guides.

The Planets

Explore the 8 major planets from Mercury to Neptune.

The Sun

The star that powers our solar system.

The Moon

Earth's closest neighbor and only natural satellite.

Dwarf Planets

Pluto, Ceres, and the worlds of the Kuiper Belt.

Compare Worlds

Side-by-side comparisons of planets and moons.

Space Facts

Mind-blowing numbers and record breakers.

Space Missions

The spacecraft that explored the solar system.

16K+ Images

Ultra-high-resolution telescope imagery.

Glossary

Definitions for common astronomy terms.

For Teachers

Free lesson plans, worksheets, and resources.