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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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Mercury Explained

Mercury is the closest planet to the sun, and it is the second smallest. It is the fastest-moving planet, so it was named after the Roman god of speed. Like Earth, it is a terrestrial planet, meaning it has a solid surface that you could land on.


NASA, UAE Space Agency to Cooperate on Getting Humanity to Mars

NASA and the UAE Space Agency will cooperate on Mars missions. Learn more about this partnership in this HowStuffWorks Now article. See more »

King Tut Found to Have a Meteoric Dagger

Did King Tut have a dagger from outer space? Get the story from HowStuffWorks Now. See more »

We've Just Solved Some Mysteries of Saturn's Icy Moon Enceladus

Solving the puzzle of the stripes on Enceladus' southern hemisphere is key to understanding one of the rings surrounding the gas giant Saturn. See more »

Probing the Sun's Physics With a New Magnetic Field Simulation

Scientists develop a new way to analyze the physics of the sun. Learn more in this HowStuffWorks Now article. See more »

Why Did It Take So Long to 'Discover' Planet Nine?

A massive planet seems to have been lurking on the edge of our solar system for some time now. Learn more about the Ninth Planet at HowStuffWorks Now. See more »

Our Closest Look Ever at Pluto’s Weird, Beautiful Surface

Pluto escaped humanity's notice for a long time, but the images from NASA's New Horizons mission made up for that. Learn more at HowStuffWorks Now. See more »

Jupiter: Yokozuna of Gas Giants, Banisher of Planets

Sumo Jupiter may have knocked a planet out into the void. Learn more about your favorite gas giant at HowStuffWorks Now. See more »

Are We Ready? 'The Martian' Can Teach Us About Planetary Survival

Can we learn about space survival from the novel "The Martian" and its new film adaptation? 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 »