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.
Time, Space and Everything in Between: The Astrophysics Quiz
Even if you're not an astrophysicist, it helps to have knowledge of the universe. Test your smarts on astrophysics with this quiz at HowStuffWorks. See more »
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?
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?
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? Find out why we owe our moon some thank-yous at HowStuffWorks. See more »
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
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
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?
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
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 »
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