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

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

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 ...

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

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

Pluto's orbit crosses Neptune's path, so why haven't they collided? The real answer involves orbital resonance, gravity, and ...

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

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

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

For generations of schoolchildren, the solar system had nine planets. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, ...

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

Nothing like the controlled disassembly of BepiColombo has ever been attempted in such a harsh environment as the region of ...