Ask almost anyone why Pluto stopped being a planet and you will hear the same confident answer: it was too small. That answer is wrong. Size was never the crime. Pluto could be twice as big and it ...

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

Twenty years ago Pluto lost its planethood, and I’m partially to blame. “Blame” is a strange word to use for what seems like a matter of mere semantics; after all, Pluto exists as an intriguing ...

Add Yahoo as a preferred source to see more of our stories on Google. NASA chief Jared Isaacman has doubled down on his stance that Pluto is without a doubt a planet. For two decades, controversy has ...

Twenty years ago Pluto lost its planethood, and I’m partially to blame. “Blame” is a strange word to use for what seems like a matter of mere semantics; after all, Pluto exists as an intriguing world ...

Pluto's demoted status as a dwarf planet turns 20 years old today and isn't even a chink in its armour when it comes to its astrological impact.

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

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

There was a time when Pluto was still a planet, until 2006. The International Astronomical Union (IAU) came up with a set of conditions required to constitute a planet. Pluto did not meet one of these ...

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 ...

NASA chief Jared Isaacman rekindled a now two-decade-long controversy when he pushed to reinstate Pluto as a planet before the U.S. Senate. Stripped of its planethood in 2006, Pluto's planet status ...

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 ...