Today, the International Astronomical Union (IAU) officially defined the word “planet” and, in doing so, redefined our solar system by downgrading Pluto’s status from “planet” to “dwarf planet”. In ...

Discover the incredible story of NASA's New Horizons mission, from its 2006 launch aboard an Atlas V rocket to its historic ...

In a series of remarkable new photos sent to us by NASA's New Horizons spacecraft during it close flyby of Pluto in July, puzzling new features are revealed in rich detail. Take a few minutes to click ...

Discovered in 1930 at the Lowell Observatory, Pluto was demoted as a planet in 2006. Some want President Trump to take action ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. This high-resolution image ...

Debate has raged for two decades over whether Pluto should be considered a planet. Some want President Trump to take action ...

"Plutophiles" have besieged Neil deGrasse Tyson ever since he made the decision 10 years ago, as director of the Hayden Planetarium in New York, to exclude Pluto from the solar system model in the ...

Pluto, once considered the ninth planet of our solar system, has been a topic of intrigue since its reclassification as a dwarf planet. Recent observations suggest that its atmosphere is expanding, ...

There are plenty of crazy ideas for missions in the space exploration community. Some are just better funded than others. One of the early pathways to funding the crazy ideas is NASA's Institute for ...

This post was updated April 2 at 8:41 p.m. April Fools’ Day or not, “Big Planet Energy” radiated throughout Bruin Plaza as a few dozen Pluto TV staff and community members celebrated the streaming ...