NASA has just made a groundbreaking discovery—a new planet beyond Neptune that wasn’t there before! This mysterious find ...

Recent research suggests there could even be oceans inside bodies beyond Pluto. That is surprising, as these bodies have surface temperatures way below -200°C. Seventy years ago, it seemed ...

A new animation shows the orbits of hundreds of dwarf planets beyond Pluto. The astronomer who compiled the data says it may capture just a small fraction of dwarf planets in the solar system.

Since it explored Pluto in 2015 the New Horizons spacecraft has been zooming toward NASAs most distant target yet Join the mission team as the probe attempts to fly by Ultima Thule an object 4 ...

We bring up this history because it is directly related to the story of Pluto. In 1846, Neptune, the fourth of the giant planets beyond the asteroid belt, was discovered—thirty times farther ...

On this date, Jan. 19, 2006, the first probe ever destined to visit Pluto, its moons and other Kuiper belt objects launched from Launch Complex 41 at what is now Cape Canaveral Space Force Station.

The Kuiper Belt is a disc-shaped region around the distant outer solar system beyond the orbit of Neptune that’s thought to be populated by icy objects and comets. Pluto is 40 times further from ...

NASA has given a new lease of life to its New Horizons mission, which in 2015 got the first-ever close-ups images of dwarf planet Pluto. Thought to be a target for cost savings, according to Space ...

This story appears in the July 2015 issue of National Geographic magazine. Small, cold, and absurdly far away, Pluto has always been selfish with its secrets. Since its discovery in 1930, the ...

The same year that Pluto was ignominiously stripped of its status, a paper was published theorizing that there was another planet, a very big planet, beyond Neptune. The Planet Nine theory was ...

Arrokoth, located a billion miles beyond Pluto, is one of the coldest places where we've directly measured the temperature.