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

With a diameter of 1,440 miles, Pluto is farthest from the sun. While major planets make roughly circular orbits, Pluto ...

The decision is still a controversial one, even among astronomers. Pluto was a popular planet, and some argue that “demoting” it did little to clarify how we understand the solar system.

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

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

Since 1930, we’ve discovered that Pluto is one of the solar system’s most fascinating worlds. It features blue skies, red snow, glaciers made of frozen nitrogen, and dunes made of frozen ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

Pluto has taken a special place in planetary scientist Alan Stern's mind since 1988. That's when he first began pushing NASA to send a spacecraft to what was then the ninth planet in our solar system.

Astronomy Solar System Pluto Pluto: Solar System's Loss is Collectors' Gain News By Robert Z. Pearlman published August 25, 2006 ...

Again, following the advice of the Division III Board and the two Working Groups, it was decided that, for naming purposes, any Solar System body having (a) a semimajor axis greater than that of ...

Pluto has been intriguing astronomers and space-lovers for decades, and ever since New Horizons visited the distant, icy world in 2015, we’ve been learning more about it than ever before.

Pluto has some characteristics less like that of a comet and more like much larger planets, according to the first analysis of Pluto’s interaction with the ubiquitous space plasma known as solar wind.