For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar ...

Every planet in the solar system is affected by multiple forces. The gravity of the Sun pulls planets toward the center of the solar system. The inertia from the creation of the planets sent them ...

The sun rises from the east, and sets in the west - this is a well-established fact for the longest time, and this is due to ...

The planets of our solar system change in position while orbiting a central star, ... This movement, however, is a result of the Earth rotating; it's not the result of the actual motion of the sun.

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory about the possibility of a giant ninth planet. The dwarf planet's existence ...

With 3.2 billion pixels and a decade-long search, the Rubin Observatory will reveal what’s been hiding in plain sight.

There may be another world lurking between the orbital lines of our solar system. Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s ...

By Jacopo Prisco, CNN (CNN) — An accidental discovery might change how we think about one of the most mysterious structures in our solar system.The ...

When you study the motion of Extreme Trans-Neptunian Objects ... All the observations and theory taken together provide decent evidence that there is a ninth large planet in our solar system.

A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ago. Then the planets began to emerge, ...

An accidental discovery in an astronomy show offers researchers a new clue about the mysterious Oort Cloud, a large expanse of icy bodies revolving around the sun.