Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

The New Horizons spacecraft passed Pluto on Tuesday, according to NASA, establishing that mankind — or at least one of its robot probes — has now visited the far reaches of our planetary system.

After eight years of being reduced to a "dwarf planet" by the International Astronomical Union in 2006, our far distant cousin is finally getting some real push to be upgraded back to a "planet ...

NASA has released a new video showing what it might be like to land on Pluto with a brand-new view of the dwarf planet's surface. The space agency’s New Horizons spacecraft spent about six weeks ...

Ever since the cameras of NASA's New Horizons mission discovered a large heart-shaped structure on the surface of the dwarf planet Pluto in 2015, this "heart" has puzzled scientists because of its ...

Pluto retrograde will begin on May 1, 2023 in Aquarius, move into Capricorn on June 11, and last until October 10. The planet goes retrograde every year for around five to six months, so we've ...