On August 24, 2006, in Prague, members of the International Astronomical Union gathered for the final day of their General ...

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there is a distant Planet Nine out there.

Add Yahoo as a preferred source to see more of our stories on Google. Tinged blue by a high-altitude haze, Pluto appears as a receding crescent in this approximately true color composite image ...

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

For decades, scientists and the general public have argued over the astronomical status of beloved dwarf planet Pluto. In the latest salvo, NASA Administrator Jared Isaacman said that he was “very ...

In 2006, a vote by the International Astronomical Union determined that Pluto was no longer a planet. The decision sparked a heated public debate, and many planetary scientists disagreed with kicking ...

Since it was stripped of planetary status, Pluto’s defenders have been fighting the decision – and they’re only getting more passionate Twenty years ago, Pluto got demoted. After a vote by the ...

While most of my columns over the more than 20 years that I have written them for the Kitsap Sun have dealt with serious issues -- wars, addictions, family struggles -- sometimes a lighter issue ...

Pluto’s atmosphere may finally be thinning as it moves farther from the sun, with observations suggesting atmospheric pressure has fallen by as much as 16%.