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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Can the curvature of the Earth only be seen from outer space?

Can the curvature of the Earth only be seen from outer space? If you didn't know that the Earth is a sphere, there are three common observations you could use to convince yourself that it is.


The Ultimate Astronomy Quiz

The Ultimate Astronomy Quiz

Man has always been fascinated by the world beyond our own, making astronomy one of the oldest sciences. Test your astro knowledge with our quiz. See more »

Pluto: Pariah, Planet or Just Pretty Cool?

Pluto: Pariah, Planet or Just Pretty Cool?

Is Pluto in or out? Get up-to-date on the planet 'voted off the island' with our quiz. See more »

What's an accretion disk?

What's an accretion disk?

Accretion disks are one way that we can spot stars and even black holes. Learn more about accretion disks at HowStuffWorks. See more »

What if we had no moon?

What if we had no moon?

What if we had no moon? Find out why we owe our moon some thank-yous at HowStuffWorks. See more »

Does it rain on other planets?

Does it rain on other planets?

Imagine sheets of methane, sulfuric acid and, yes, even diamonds falling from the sky. HowStuffWorks explains how it how it rains on other planets. See more »

The Fastest Quiz You'll Ever Take

The Fastest Quiz You'll Ever Take

Ready for the fastest quiz you'll ever take? Take this quiz on the fastest things in the universe at HowStuffWorks. See more »

10 Fastest Things in the Universe

10 Fastest Things in the Universe

We're about to power through some of the fastest stuff in the universe. Learn about the 10 fastest things in the universe at HowStuffWorks.com. See more »

What happens when the sun eats a comet?

What happens when the sun eats a comet?

When the sun eat a comet, several things can happen. Learn more about comets meeting up with the sun at HowStuffWorks. See more »

10 Ways to Stop a Killer Asteroid

10 Ways to Stop a Killer Asteroid

Killer asteroids are all fun and games -- until they're headed for earth. Luckily, scientists have come up with 10 ways to stop a killer asteroid. See more »

Did the moon doom the Titanic?

Did the moon doom the Titanic?

Did the moon doom the Titanic? Find out whether there's any truth behind the theory that the moon caused the Titanic to sink. See more »