The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

Astronomers have uncovered a massive new trans-Neptunian object, 2017 OF201, lurking at the edge of our solar system. With an ...

Each planet is unique, just like how every person in a family is different. For example, Mercury is the smallest planet in our solar system, and it's also the closest one to the Sun.

WHETHER or not you believe in life beyond Earth, there are actually a minimum of 100 billion planets in our universe, according to a Nasa study. But how many planets make up our solar system?

A quick guide to planets, including the eight in our solar system, how they form, and how many could be in the universe.

From the scorching surface of Mercury to the icy edges of Neptune, our planetary neighborhood is full of wonders. The order of the planets isn’t just trivia—it tells a story about temperature, ...

Astronomers have discovered a rare solar system in the Milky Way with six planets orbiting in perfect rhythm like a cosmic orchestra.

Most planet-forming disks have warps that can lead to planets on inclined orbits, which could explain where the tilt of Earth ...

Go look at The Planets Today. Notice anything strange? The planets are all on one side of the Solar System, with Earth somewhere in the “middle” of the cluster. While this is normal, natural ...

The smallest and largest planets that form our solar system range incredibly in temperature, composition, geology, and of course size.