Search Results | international astronomical union
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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.
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.
88 Constellation Names (and 24 You Can Only See From the Northern Hemisphere)
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The night sky has been mapped and studied for thousands of years, with constellations serving as guides for navigation, storytelling and scientific observation. The International Astronomical Union officially recognizes 88 modern constellations, each occupying a specific section of the celestial sphere. Some date back to ancient Greek constellations, while other constellation names were introduced in the modern era.
The Truth Behind the Rogue Planet Nibiru
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The idea of planet Nibiru, sometimes dubbed Planet X, has captivated doomsday prophets and conspiracy theorists for decades.
What Are Moonmoons?
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What are moonmoons? HowStuffWorks looks at the moons of moons.
Why Did It Take So Long to 'Discover' Planet Nine?
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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.
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.
The Ultimate Astronomy Quiz
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Though the astronomy field has evolved from its primitive beginnings, there's still a boundless cosmos to explore. Test your astronomy knowledge with our quiz.
How Many Moons Does Jupiter Have? We're Losing Count
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Scientists are continually discovering more moons orbiting the outer planets, particularly Saturn and Jupiter. Just how many moons does Jupiter have?
How Many Moons Does Saturn Have?
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In recent years, Saturn has overtaken Jupiter as the planet with the most satellites in our solar system. How many moons does Saturn have?