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

Add Yahoo as a preferred source to see more of our stories on Google. Guests visting the Lowell Observatory in Flagstaff, Arizona during the I Heart Pluto Festival gaze at celestial objects from the ...

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

Pluto has long been one of the most debated celestial bodies in our solar system. Once classified as the ninth planet, it was redefined in 2006 as a dwarf planet, a decision that still sparks ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. This image of Pluto was made after the New Horizons spacecraft flew past the dwarf planet on July ...

The renewed push is stirring controversy nearly two decades after the dwarf planet classification was introduced. Renewed ...

President Donald Trump and his NASA administrator are reviving the Pluto debate again — apparently at the urging of “Star ...

SALT LAKE CITY -- After nearly 10 years of waiting and more than 3.6 billion miles, the New Horizons space mission finally reached Pluto, and the first images of the dwarf planet were released ...

Our solar system is much like a trail of microcosmic breadcrumbs: Follow the molecular bits as far back as they go, and you'll learn a thing or two about where many of our planets and other celestial ...

Flagstaff, Arizona (CNN) — For no explainable practical reason, humans are enamored with – and even empathetic toward – specific inanimate objects. Our first car. A choice coffee mug. And for a ...