Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

This explorer spacecraft is heading to a rare asteroid with a naked metal core. It could hold clues to how Earth began ...

Webb has captured a frigid exoplanet in a wildly tilted orbit, revealing a system shaped by past planetary violence and ...

How Many Planets Are There in the Solar System? There are 8 planets in our solar system. The planets orbit the Sun in ...

Have you ever wondered how long it would take to travel to each planet in our solar system? With vast distances separating ...

Wide-orbit planets are fairly common according to the study, and there's a good chance we have one of our own.

The search for life beyond Earth is a holy grail quest for many experts, but finding where to look is a core issue.

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

A team of international astronomers has uncovered what may be a gas giant planet forming around a distant young star. Using ...

New research shows there is at least a 40% chance of the existence of Planet Nine, but scientists are still looking for ...

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.

Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a highly ...