Twenty years after Pluto lost its planetary status, the debate continues as scientists still disagree over what defines a ...

Pluto lost its planethood for a very specific reason. Whether or not that’s a good reason depends on who you ask.

A 24-year-old observatory assistant from the Midwest discovered Pluto. Clyde Tombaugh, born in 1906 in Streator, Illinois, ...

Unpopular opinion time, Pluto being reclassified as a dwarf planet was a great thing for our understanding of the solar ...

On the 20th anniversary of Pluto’s infamous demotion, Mike “Pluto Killer” Brown explains why any reversal of that decision ...

Twenty years after Pluto became a dwarf planet, people are still fighting over its status. Experts explain why the debate ...

Two decades ago, Pluto was reclassified as a dwarf planet, sparking an enduring debate. NASA Administrator Jared Isaacman ...

Learn how Pluto nearly kept its planet status in a proposed 12-planet Solar System as its demotion marks its 20th anniversary ...

August marks 20 years since astronomers made one of the most controversial decisions in modern astronomy: Pluto was no longer ...

M onday, August 24 marks the 20th anniversary of the International Astronomical Union (IAU) vote to adopt a formal definition ...

The discovery of the Kuiper Belt revealed thousands of icy objects near Pluto, challenging its status as a planet. After the ...

For the first time since its discovery in 1920, Pluto is entering the outer solar system—a journey that’s slowly thinning out its atmosphere.