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

Scientists studying the interstellar object ‘Oumuamua have proposed that it may be a fragment from a Pluto-like planet beyond ...

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

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, ...

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

Hubble spots white dwarf star 'snacking' on chunk of Pluto-like object. The NASA/ESA Hubble Space Telescope has spotted a ...

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

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

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

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 ...

Pluto's surface stays at about −393°F (−236°C), cold enough that nitrogen there isn't a gas at all but a glacier miles deep.