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 ...

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

Since it was stripped of planetary status, Pluto’s defenders have been fighting the decision – and they’re only getting more passionate ...

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 ...

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

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

The discovery of the Kuiper Belt revealed thousands of icy objects near Pluto, challenging its status as a planet. After the discovery of Eris, astronomers formally redefined “planet” in 2006, leading ...

In a groundbreaking discovery, astronomers have identified a potential dwarf planet candidate, 2017 OF201, buried within ...

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

Picture a star, about half the sun's mass shining with a dim red light. Lumbering around it on a 5,000-year orbit is a huge orb called a brown dwarf, which is much heavier than a planet but still not ...

Those who supported Pluto’s demotion included Neil DeGrasse Tyson NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute Image 20 years ago, news broke that Pluto had ...