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International Astronomical Union
Table of Contents
Introduction References & Edit History Quick Facts & Related Topics
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How do features on Pluto and its moons get their names?
Why isn't Pluto a planet?
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Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles
Why Is Pluto No Longer a Planet?
Planet Earth and lunar moon from space
Where Did the Moon Come From?
solar eclipse, sun, moon, astronomy, space
How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?
Arrangement of the phases of the moon in total eclipse with Blood Moon
9 Celestial Omens
1 July 2002: The Solar and Heliospheric Observatory (SOHO) satellite reveals a massive solar eruption more than 30 times the Earth's diameter. The eruption formed when a loop of a magnetic field over the surface of the Sun trapped hot gas.
6 Questions About the Sun Answered
Discover
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
Candles Burning On Table In Church
What Is the Most Widely Practiced Religion in the World?
Space race (1957-1969) infographic between United States (U.S.) and Russia. America, Soviet Union, U.S.S.R., space exploration
Timeline of the Space Race, 1957–69
World Data Locator Map: Australia
Is Australia an Island?
July, 2006, Launch of Space Shuttle Discovery STS-121. See attached for full caption information.
Will Light-Speed Space Travel Ever Be Possible?
Two chicks near an egg with a white background (poultry, chick, chickens, birds).
What Do Eggs Have to Do with Easter?
Illustration for Demystified "How Dangerous is Quicksand"
How Deadly Is Quicksand?

International Astronomical Union: Facts & Related Content

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News •

University presents plaque marking asteroid named after late painter • Apr. 21, 2025, 8:53 AM ET (Taipei Times)

Facts

Also Known As IAU
Date 1919 - present
Headquarters Paris
Areas Of Involvement astronomy
Related People Arthur Eddington

Videos

How do features on Pluto and its moons get their names?
Why isn't Pluto a planet?
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Related Topics and References

Topics

Related Quizzes and Features

Demystified
Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles
Why Is Pluto No Longer a Planet?