Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have discovered a new planet in our solar system. advertisement.

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

An icy object in perfect sync with Neptune reveals new details about planetary migration and unseen bodies far beyond the Kuiper Belt.

Since it’s so far from the sun an average of about 3.7 billion miles, the farthest planet in the solar system and because it’s the smallest, scientists thought Pluto’s gravity would not be ...

There's more to the solar system beyond Pluto's orbit. Researchers have discovered a new dwarf planet nearly 7.5 billion miles away from the sun. Even more intriguing, the discovery suggests the ...

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why Pluto isn't a planet.

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.