As astronomers continue discovering unusual worlds beyond our solar system, many say the question that divided scientists in ...
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 ...
Since it was stripped of planetary status, Pluto’s defenders have been fighting the decision – and they’re only getting more passionate ...
Pluto's orbit crosses Neptune's path, so why haven't they collided? The real answer involves orbital resonance, gravity, and ...
Those who supported Pluto’s demotion included Neil DeGrasse Tyson ...
For generations of schoolchildren, the solar system had nine planets. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, ...
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 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 ...
Pluto lost its planethood for a very specific reason. Whether or not that’s a good reason depends on who you ask.
Scientists continue to disagree over how worlds in the solar system should be classified. The argument turns on whether ...
In a groundbreaking discovery, astronomers have identified a potential dwarf planet candidate, 2017 OF201, buried within ...