As astronomers continue discovering unusual worlds beyond our solar system, many say the question that divided scientists in ...

A 24-year-old observatory assistant from the Midwest discovered Pluto. Clyde Tombaugh, born in 1906 in Streator, Illinois, grew up fascinated with the solar system. A self-taught astronomer, he built ...

The spacecraft is currently approaching the outer boundary of the solar system as it prepares to cross into interstellar space.

On the 20th anniversary of Pluto’s infamous demotion, Mike “Pluto Killer” Brown explains why any reversal of that decision would be driven more by nostalgia than science ...

For decades, Pluto remained one of the most mysterious objects in our solar system, until July 14, 2015, when NASA's New Horizons spacecraft became the first mission to visit it up close, capturing ...

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

The story of Pluto is quite interesting. While it is part of our solar system and it was even considered a planet, it was dismissed back in 2006 and set down as a dwarf planet. For years, the decision ...

Pluto just picked up a powerful ally: the head of NASA. Testifying before a Senate panel on the 2027 NASA budget Tuesday, Administrator Jared Isaacman made clear he wants the icy world reinstated as a ...

Those who supported Pluto’s demotion included Neil DeGrasse Tyson ...

Twenty years after Pluto lost its planet status, the debate is suddenly alive again. After a 10-year-old wrote to NASA asking ...

Forbes contributors publish independent expert analyses and insights. Amanda Kooser covers the quirky side of science and space. Pluto has five moons, but Charon stands out from the rest. Charon is ...

On Friday, NASA released a new image of Pluto's surface, revealing the icy plains that make up part of the "heart" first spotted in earlier images. Now informally named “Tombaugh Regio” (Tombaugh ...