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Why Is Pluto No Longer Considered a Planet?
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On Aug. 24, 2006, the International Astronomical Union (IAU), an organization of professional astronomers, passed two resolutions that collectively revoked Pluto's planetary status.
Terrestrial Planets Are the Rocky Planets of the Solar System
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Terrestrial planets include the four closest to our sun, including Mercury, Venus, Earth and Mars. What else makes these celestial bodies terrestrial planets?
How 'Planet Earth' Works
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'Planet Earth' is one of the most comprehensive and wide-reaching documentaries the Discovery Channel has ever produced. Take a look inside 'Planet Earth.'
What Are the Solar System Planets in Order?
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You know Saturn and Venus and Mars. Can you put the eight planets of the solar system in the correct order? There are several ways to do this.
How Will We Colonize Other Planets?
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We've been cruising to and from the International Space Station since 2000. Isn't it about time we started moving on to other space destinations and establishing human outposts?
Pluto: Is It a Planet After All?
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Back in 2006, the International Astronomical Union decided to demote Pluto to the status of a dwarf planet. A historical study challenges that designation.
Can You Name the Landform From a Definition?
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From mountains to battures, hoodoos to plains, our planet is covered in landforms of all types. How well do you know them? Start taking this quiz to find out!
Can You Match the Word to Its Definition?
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Are you the fast-talker, sweet-talker or overall-high-falutin' talker in your circle of friends? If so, we've got a quiz we're sure will challenge your language skills. Try it now and see if your vocabulary is really in tip-top shape!
Can You Match at Least 10 of These Science Words to the Right Definition?
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Science was never our strong suit, but do you have the smarts to slay this hard-AF science-terminology quiz? If you manage to match at least 10 of these science words to their correct definitions, you'll take your place next to the GOAT Thomas Edison.
Planet Mercury: Fast, Pockmarked and Shrinking
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Mercury is the closest planet to the sun, and it's the smallest in the solar system. So why does it have longer days than we have on Earth?