There has been a lot of back and forth about the existence of a mysterious ninth planet, often referred to as "Planet Nine" ...

Computer simulations show that planets could be flung out of the inner solar system, supporting the possible existence of a ...

In an exciting breakthrough in planetary science, a recent study has increased the likelihood of Planet Nine’s existence by ...

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

The lone planet confirmed to be in the system is squeezed in between the two, orbiting at a distance similar to Earth's distance from the Sun. And, as an added bonus, the planet is orbiting backward ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region thought to be largely devoid of objects ...

Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there ...

But there are many other possible pathways. All the more probable formation scenarios are based on GJ 367b once having been a rocky planet, not unlike Earth or Mars. Its two companion planets ...

Every planet in our solar system is essentially round. But out in the universe, are there any planets that aren't spherical? Technically, planets are round, by definition; they need to have enough ...

There may be some differences between the audio and the text. Is there life on another planet? The age-old question that has been debated for centuries might soon get an answer. Hello and welcome ...