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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Neptune Explained

Neptune is the eighth planet from the sun, the fourth largest, and a gas planet. It is named after the Roman god of the sea. Neptune is four times the size of Earth, and its day lasts a little more than16 hours. Its year is about 165 Earth years. Neptune's orbit is a perfect circle. The last stop on spacecraft Voyager's epic trip through the solar system was the gas giant Neptune.


Will orbital chaos cause Earth, Venus and Mars to collide?

Will orbital chaos cause Earth, Venus and Mars to collide?

Will orbital chaos collide Earth, Venus and Mars? Read about the possibility of Earth, Venus and Mars colliding if their orbits go awry. See more »

How NASA Planetary Protection Works

How NASA Planetary Protection Works

What if your job were to protect life in the galaxy at all costs? Read about NASA's Planetary Protection program at HowStuffWorks. See more »

Can someone own the moon?

Can someone own the moon?

Can someone own the moon? Learn all about real estate on the moon what it takes to get your own lunar property. See more »

Is a major planetary alignment coming in 2012?

Is a major planetary alignment coming in 2012?

Is a major planetary alignment coming in 2012? Find out whether a major planetary alignment is coming in 2012 at HowStuffWorks. See more »

Are major solar flares coming in 2012?

Are major solar flares coming in 2012?

Are major solar flares coming in 2012? Find out whether major solar flares are coming in 2012 at HowStuffWorks. See more »

Could we stop an asteroid on a collision course toward Earth?

Could we stop an asteroid on a collision course toward Earth?

To stop an asteroid that is on a collision path with the Earth would be a monumental task. Find out how scientists are researching ways to stop an asteroid. See more »

How do planets form?

How do planets form?

Planets and how they form are explained in this article from HowStuffWorks. Learn about planets and planet formation. See more »

What's more important, water on the moon or on Mars?

What's more important, water on the moon or on Mars?

The existence of water on the moon and Mars is explained in this article. Learn about water on the moon and Mars. See more »

Could an extremely powerful solar flare destroy all the electronics on Earth?

Could an extremely powerful solar flare destroy all the electronics on Earth?

Solar flares and their effect on electronics are explained in this article. Learn about solar flares. See more »

How Sunspots Work

How Sunspots Work

Sunspots are explained in this article. Learn about sunspots. See more »