Think you know Pluto? From icy plains to planetary debates, this quiz dives deep into the mysteries of our solar system’s most controversial—and captivating—dwarf planet.

In Roman mythology, Pluto is the god and ruler of the dead. For a return mission to the dwarf planet, Howett and her ...

On Aug. 24, 2006, the International Astronomical Union (IAU) decided that Pluto wasn't a planet anymore. Instead, Pluto is ...

Pluto’s heart-shaped feature, known as Tombaugh Regio, has captivated scientists and the public alike since its discovery.

On Aug. 30, 1992, astronomers spotted an object orbiting the sun beyond Pluto for the very first time. Before then, Pluto was believed to be the most distant planetary body of our solar system. No one ...

Pluto, once considered the ninth planet of our solar system, has been a topic of intrigue since its reclassification as a ...

Spacecraft Will Reach Pluto in July, Revealing Last Face in Solar System After almost a decade in flight, New Horizons is approaching the enigmatic dwarf planet. What it will find there is anybody ...

A spacecraft is set to awake from a long hibernation this week as it prepares for its upcoming encounter with Pluto.

New images of Pluto are beginning to arrive from NASA's space probe, and they're already allowing scientists to update what we know about the dwarf planet.