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Science | Space | The Solar System

In the Solar System Channel, you can explore the planets and celestial objects around our own sun. Learn about topics such as Mars, Jupiter and the Moon.

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Uranus Explained

Uranus is the seventh planet from the sun, and is named for the ancient Greek deity of the Heavens, the earliest supreme god. It is the third largest planet in the solar system, and is three times as large as Earth.


How Solar Eclipses Work

How Solar Eclipses Work

Solar eclipses are rare and amazing phenomena. Learn about what happens in a solar eclipse and how to observe one safely. See more »

Why is Pluto no longer considered a planet?

Why is Pluto no longer considered a planet?

On Aug. 24, 2006, the International Astronomical Union (IAU), an organization of professional astronomers, passed two resolutions that collectively revoked Pluto's planetary status. See more »

Where did the moon come from?

Where did the moon come from?

The origin of the moon is explained in this article. Learn about the origin of the moon. See more »

Our Amazing Solar System

Our Amazing Solar System

Our solar system has a variety of small objects such as asteroids, comets, stars, meteors, and moons. Find out how they affect life on Earth. See more »

Jupiter Explained

Jupiter Explained

Jupiter is the largest planet and is fifth from the sun. It is the third-brightest spot in our skies--after the sun and Venus. Jupiter is made up almost entirely of gas, which means it doesn't have a solid surface like Earth does. See more »

Pluto Explained

The smallest and most-distant planet in our solar system is tiny, icy Pluto. It is even smaller than our moon, and wasn't discovered until 1930 — the only planet discovered in the twentieth century. See more »

Mercury Explained

"Mercury is the closest planet to the sun, and it is the second smallest. Learn more about Mercury here." See more »

The Solar System Explained

"The solar system that consists of nine (and possibly ten) planets orbiting a giant, fiery star we call the sun. Find out more here." See more »

Neptune Explained

Neptune Explained

"Neptune is the eighth planet from the sun, the fourth largest, and a gas planet. Learn more about Neptune here." See more »

Uranus Explained

Uranus Explained

"Uranus is the third largest planet in the solar system, and is three times as large as Earth. Learn more about Uranus here." See more »