Pluto isn’t the only dwarf planet in our solar system's outer reaches. Now is an ideal time to look for the egg-shaped Haumea ...

An curved arrow pointing right. NASA's New Horizons probe flew past Pluto last July, and it took the most detailed images of the planet that have ever been seen. NASA just released some of the ...

Everyone's favorite dwarf planet, Pluto, was discovered just 95 years ago. Here's the story of how the once-ninth planet was ...

A ninth planet, Pluto, had been discovered ... where you can see mountains and craters and valleys, all this stuff up close," ...

But by counting all the asteroids, the number got up above ... nine planets, which came about in the 1960s and lasted only until 2006, was a blip on the screen. And if you are still a Pluto ...

The problem was that the term "planet" had no firm definition ... to that end for this winter. Pluto will always be special. We'll see it up close when the New Horizons spacecraft, launched ...

A blue atmosphere, smooth areas, and youthful mountain ranges - this dwarf planet is full of surprises. When NASA's New Horizons probe flew past Pluto in July 2015, the images it returned astonished ...

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 ...

With the exception of Pluto, planets in ... remotely for terrestrial planets around other stars. The layers of gases surrounding the surface of a planet make up what is known as an atmosphere.