If you grew up learning that Pluto was a planet, chances are you were sticking to that, no matter what the IAU said. After ...

Pluto was once called the ninth planet, but in 2006, scientists changed its status to a dwarf planet. A planet must clear its orbit of other objects, but Pluto shares its space with many small icy ...

Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...

A surprising chemical difference between Pluto and Sedna, another dwarf planet in the distant Kuiper Belt ... but the bulk of the molecules do not," Bettati said. They also used another model known as ...

April on Pluto is a month-long celebration of Earth Day, with the streamer releasing a bunch of breathtaking nature documentaries shining a light on the planet's amazing wildlife. Here's what else ...

Ellipses are defined as curves that surround two focal points. At any point on the ellipse, the sum of the distance to both ...

The ringed gas giant Saturn has officially replaced Jupiter as the planet in our solar system with the most moons. The International Astronomical Union officially recognized 128 new moons orbiting ...

A surprising chemical difference between Pluto and Sedna, another dwarf planet in the distant Kuiper Belt, is helping scientists nail down their respective masses, a new study reports. The Kuiper ...