Pluto Demoted Day

Pluto Demoted Day is recognized by the scientific community on August 24 each year. This holiday marks the important astronomical fact that Pluto is no longer considered a classical planet but is now classified as a dwarf planet. This change in status reflects ongoing advancements in space research and our understanding of the solar system.

History

On August 24, 2006, the International Astronomical Union (IAU) announced that Pluto did not meet all the requirements to be classified as a classical planet. The IAU established criteria for a celestial body to be considered a planet: it must orbit the Sun, have enough mass to assume a nearly round shape, and must not be a satellite of another body. Pluto was found not to meet all these criteria and was reclassified as a dwarf planet.

Interesting Facts

• Pluto was discovered in 1930 by Clyde Tombaugh, an astronomer at Lowell Observatory.
• The name “Pluto” was suggested by an 11-year-old schoolgirl, Venetia Burney, who had a keen interest in mythology and thought the name suited the distant, icy world.
• Pluto is also known as the 134340^th object in the catalog of minor planets.
• The verb “to pluto” has been coined, meaning to demote or reclassify something.

How to Take Part

• Learn more about space exploration and the classification of celestial bodies.
• Visit an observatory or spend an evening stargazing with friends and family.
• Share information about Pluto Demoted Day on social media using the hashtag #PlutoDemotedDay.

When is Pluto Demoted Day in 2025?

Pluto Demoted Day is observed on August 24 each year.

Observations