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

The Earth and the Moon found out that there is a Ninth planet, and they decided to find it... Welcome to the SpaceBalls channel!

There has been a lot of back and forth about the existence of a mysterious ninth planet, often referred to as “Planet Nine” or even “Planet X.” Now, though, researchers say there is likely ...

The ‘fire planet’ between Mercury and the sun The theory of a ninth planet in the solar system orbiting Mercury is directly connected to the theory of general relativity created by Albert Einstein to ...

For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar system. Now, a team of researchers have taken a completely different ...

A Planet That Shouldn't Exist? According to infrared data from the IRAS and AKARI satellites, this object, up to 17 times the mass of Earth, completes an orbit every 10,000 to 20,000 years.

The gravitational tug could cause instability to completely stable objects, including Pluto: formerly the ninth planet of our solar system. Over the course of five billion years, stars could ...

OF201, the object belongs to the same all-star family as Pluto: dwarf planets. Its diameter, roughly 435 miles (700 km), is half Pluto’s, ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its status as the ninth planet in our Solar System.

By the spring of 1989, with a new Ph.D. in astrophysics and planetary science, Stern was already thinking about how to get NASA to send a mission to the ninth planet. He started talking up the idea.