Pluto Fans Celebrate the Former Ninth Planet at Annual ‘I Heart Pluto’ Festival in Arizona

Pluto may have lost its official status as a planet, but its loyal fans are keeping its legacy alive.

Each year, hundreds of space enthusiasts travel to Flagstaff, Arizona, for the “I Heart Pluto” Festival, a multi-day celebration honoring the distant world discovered nearly a century ago. The city holds special significance in Pluto’s history. In 1930, astronomer Clyde Tombaugh discovered Pluto while working at Lowell Observatory in Flagstaff.

For decades, Pluto was taught in classrooms as the ninth planet in our solar system. But in 2006, the International Astronomical Union reclassified it as a “dwarf planet,” reducing the official count of planets to eight. The decision remains controversial among some scientists and space fans.

Despite the change, Pluto continues to inspire fascination. NASA’s New Horizons spacecraft flew past Pluto in 2015, capturing the first close-up images of the icy world and revealing features such as massive glaciers and a bright, heart-shaped region of frozen nitrogen.

The annual festival includes lectures, science presentations, and even a Pluto-themed pub crawl. Attendees celebrate both the scientific discovery and the cultural legacy of the small but beloved world.

Arizona lawmakers have even declared Pluto the state’s official planet, reflecting the pride tied to its discovery there.

For many attendees, the event is less about scientific debate and more about celebrating exploration, curiosity, and the enduring wonder of space.

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