The researchers said 2017 OF201 was identified in observations by telescopes in Chile and Hawaii spanning seven years.

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

A breathtaking new video compresses more than a decade of deep-space observation into a few seconds, revealing the hypnotic motion of distant worlds. The animation, created by astrophysicist Jason ...

Read Two views of the planet Uranus appear side-by-side for comparison. At the top, left corner of the left image is a ...

So what does this all add up to? The researchers developed a capture cross-section for the solar system's phase space then calculated how many rogue planets are in our solar system's vicinity.

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

The solar system is approximately 4.6 billion years old. Astronomers believe that roughly 100 million years into its existence, the planets first began to form in a rotating, flat cloud of gas ...

Planets form in clouds of gas and dust known as protoplanetary disks around young stars. But the formation process of multi-planet systems, like our own Solar System, is still poorly understood.