Pluto has long been one of the most controversial objects in our Solar System. For decades it proudly held the title of the ninth planet, only to be reclassified in 2006 as a dwarf planet. That ...

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

Add Yahoo as a preferred source to see more of our stories on Google. Pluto’s thin, hazy atmosphere shows its blue color in this view from NASA’s New Horizons probe, captured as the spacecraft looked ...

Pluto is no longer a planet, but why did it lose that title? The change came in 2006 from the International Astronomical Union, which wanted a clear definition of what a planet actually is. Before ...

For decades, scientists and the general public have argued over the astronomical status of beloved dwarf planet Pluto. In the latest salvo, NASA Administrator Jared Isaacman said that he was “very ...

NASA chief Jared Isaacman rekindled a now two-decade-long controversy when he pushed to reinstate Pluto as a planet before the U.S. Senate. Stripped of its planethood in 2006, Pluto's planet status ...

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

Named for the ancient Greek god who presides over the afterlife, Pluto is now mostly known as the planet that lost its planethood 20 years ago. In August 2006, the International Astronomical Union, an ...

Since it was stripped of planetary status, Pluto’s defenders have been fighting the decision – and they’re only getting more passionate Twenty years ago, Pluto got demoted. After a vote by the ...

For 76 years, generations of students learned that our solar system had nine planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. Now, in 2026, some still can't get over ...